Crash, exit or high CPU when viewing certain directories

See also:


This FAQ helps you if Directory Opus crashes, exits or uses high CPU when you view a certain folder or folders containing certain types of files. These problems are usually caused by bugs in 3rd party components and this FAQ contains steps for finding and disabling the faulty component.*

Known Issues:

  • See also: Shell extensions which are blocked by default

  • Intel Optane / iaStorAfsServiceApi Service:

    Software related to Intel's Optane technology has caused major CPU usage for some people, affecting both Opus and File Explorer. See these threads:

  • Broken Icon Packagers:

    If an "Icon Packager" (Icon Replacer, etc.) tool has been installed, it may be broken and slowing down folder reading in the tree or file display. To fix this try the following:

    • Open RegEdit.exe.
    • Go to HKEY_CLASSES_ROOT\exefile\shellex
    • If there is an IconHandler key below there, rename it to IconHandler_Not.
    • Reboot your computer.
  • Boxcryptor:

    If you have the Boxcryptor software installed and find directories open very slowly, this solution is worth trying before anything else: Searching resulting in 'Not Responding' [Boxcryptor icon overlays] - #24 by Peter1712

  • Windows 10 Fall Creators Update:

    A bug in the Windows 10 Fall Creators Update can cause Windows to constantly refresh thumbnails and slowing down Opus (and other programs) a great deal. A fix which has worked for people affected by this comes from a Microsoft Community thread:

    • Open RegEdit.exe.
    • Go to HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\VolumeCaches\Thumbnail Cache.
    • Change the Autoruns REG_DWORD value from 1 to 0.
    • Reboot your computer.

    Another issue with Windows 10 updates is they have a history of overwriting good, working hardware drivers with old, broken ones, or drivers for the wrong hardware. Checking that your drivers are correct and up-to-date, from the manufacturer's website, is recommended. (GPU, network, chipset/motherboard and storage drivers are the ones most likely to affect Opus.)

  • Old versions of Icaros (part of K-Lite codec pack):

    New versions of Icaros are a complete re-write and have been reported to work great now.

    Old versions of the Icaros shell extension had been reported to cause several issues within Opus. If you have Icaros or K-Lite installed, please make sure they are up to date.

  • Cloud Storage tools (Google Drive, OneDrive, Bitcasa, etc.):

    We've had a few reports of crashes due to shell extensions which are part of Bitcasa, Google Drive, and other cloud storage tools. If you're experiencing crashes and have those or similar tools installed, it might make sense to try disabling their shell extensions using ShellExView (see below) as a first step. They aren't always the cause of problems, but it seems they are often enough that you may save time by focusing on them first.

  • Acronis TrueImage:

    Some versions of TrueImage cause various problems in both Opus and Explorer. If you have TrueImage installed, try using ShellExView to disable all of its shell extensions and then reboot and try what you were having problems with before, to see if they were involved.

  • LibreOffice:

    If you add the PageCount column which is supplied by the LibreOffice shell extension, then go into a folder containing a PDF file, older versions of Opus may crash or exit.

    Directory Opus and above automatically blacklist the LibreOffice shell extension to avoid this problem.

  • Alcohol:

    There have been reports from a couple of users that the Alcohol CD writing/mounting software can cause Opus to crash when viewing directories with ISO files in them. If you have Alcohol installed and the crash only seems to happen with directories containing .iso files, try disabling the related shell extensions to see if they were involved.

  • Toolbars:

    If you have customized your toolbars and see slowdowns (but not crashes) when changing to all folders, not connected to particular folders or file types within them, then the problem might be a toolbar button which is taking a long time to refresh after folder changes. Buttons which point to inaccessible network drives or spun-down HDDs can cause such delays, for example. But similar problems can also be caused by shell extensions (see below).

  • Script Add-Ins:

    Script Add-Ins can run custom code on every folder change, and that could impact performance for some or all folders. If you have any scripts installed, try disabling them to test if they are involved. (Settings > Preferences > Toolbars > Scripts)


  • Right-click Context Menus: If you are experiencing problems when opening right-click context menus, rather than when viewing directories, then you should read the separate FAQ entry about that issue.

  • Definition of "high CPU": When this page says "high CPU" it means that something running inside of Opus has become stuck in a loop using as much CPU as it can get on a single CPU thread and doesn't stop until you exit or terminate the program. You'll see approximately 100% CPU usage on a single-core system, 50% a dual-core, 25% on a quad-core, and so on.

Isolating the cause:

If you experience crashes, apparently spontaneous exits, or high CPU usage when you open a Directory Opus window and point it to certain folders or folders containing certain types of files then the problem is likely caused by an Explorer shell extension, a video codec or an Opus viewer plugin that is going wrong because of the contents of one of the files in the directory.

Note that, depending on the columns you have showing, shell extensions, video codecs and viewer plugins can be called in all view modes. Opus may call on them to extract information from the files even if you are not viewing them or generating thumbnails for them.

You can usually diagnose this problem in two ways:

  1. Work out which file is causing the crash:

    Shortcuts to items on unreachable network folders can often cause delays so check for them first.

    If there are only a few files in the problematic directory, or only a few different types of files, then you may find it quicker to isolate the different files/types into separate directories, then see if you still experience a crash when Opus views the directories individually.

    Once you narrow things down to a particular type of file it may point you towards the faulty plugin or extension.

  2. Work out which plugin or extension is causing the crash:

    Viewer plugins and shell extensions are usually involved with crashes (etc.) when viewing particular directories. These may come with Opus but most often come as part of other software.

    These days, shell extensions are more likely to cause problems than viewer plugins, but viewer plugins are much quicker and easier to test so it still makes sense to rule them out first.

    Viewer plugins:

    Go to Preferences / Viewer / Viewer Plugins and make a note of the plugins which are currently enabled (so you can restore them later).

    A good first bet is to try disabling the Movie plugin. If you find this cures your problem then the issue is likely due to a bad video codec installed on your system. (You should be very careful when installing video codecs, or codec packs, as they can clash with each other and some versions of video codecs are very buggy.)

    You may also find the separate Problems with AVI Files FAQ useful.

    If you're still having problems then try disabling all of the other plugins. If this fixes it then you should try re-enabling them until you've worked out which one is at fault.

    Shell extensions:

    Shell extensions are a type of plugin that work with both Explorer and Opus. When they go wrong they can crash either program, although they may only crash one or the other due to slight differences between the two (as well as the fact that while all shell extension authors test using Explorer, only some perform additional tests using Opus).

    You can use a tool called ShellExView to see which extension are on your computer and try disabling some of them. (Disabling extensions via ShellExView is supported by Opus 10 and above, but not earlier versions.)

    A good first step is to try disabling (or uninstalling, if they are unwanted) any non-Microsoft extensions. This is especially true for any extensions which may interact with the network or with video/audio files, e.g. ones which talk to source-control servers or "cloud" storage services. The extensions mentioned in the Known Issues list above are also worth disabling at the start of your search, in case they are causing you problems as they have many others.

    After disabling extensions, it is best to reboot (or at least exit Opus, but don't just close all the Opus windows -- it continues to run in the background by default -- you need to fully exit Opus) in case they had already been loaded before they were disabled.

    Some Microsoft shell extensions may also be worth disabling (and occasionally cause problems), especially ones which are part of products like Office rather than part of Windows itself. But even ones that are part of Windows have caused problems in the past, especially with Windows 10.

    If the problems go away with most of the extensions disabled, you can then try enabling some of them again to see if you can narrow down the problem to a particular extension. It's sometimes quicker to do this in batches, e.g. re-enable half the extensions and see if the problem comes back; if it does, you know the problem extension is in that half; if it doesn't, it's probably in the other half.

    If you do find a problematic component, see if there's an update or hotfix for the piece of software it's a part of. It's often (though obviously not always) the case that such problems have already been fixed by the software vendor and you just have to work out which thing needs updating.

If you track down your problem to a particular file, plugin or shell extension then please report it via these forums (and to the authors of any involved 3rd party component, if applicable) to help anyone else who is using it, and in case a fix or workaround can be developed.

Crash dump investigation:

If you cannot find the cause using the methods above, and the problem is a full crash, then there should be a crash dump corresponding to the time of each crash.

We'll only look at crash dumps from people with linked accounts. Please start a thread if you wish to send them to us, with details of what's going wrong and what you have tried already, and we can advise further.

Crash, exit or high CPU when right-clicking certain files
General slowdown or instability investigation steps
How to find components causing high CPU usage
DOPUS + Blu-ray = crash
Dopus has stopped working (win32 exception)
High CPU usage, message 033920 = 0x08480
Synchronise is SO slow
Synchronise is SO slow
Very noticeable speed decrease after upgrading to Pro yesterday
Crash blue screen when opening fonts folder
Directory Opus has encontered a program error
Dopus is driving me nuts! (Conflict w/ Visual Tooltips?)
Automatically Scan Folders for Thumbnail View?
Slow DOpus using 50% CPU
Mozy Backup causing slow folder reads in Explorer and Opus
Strange crash
Loading of My Documents Folder Taking 20 seconds of reading
Dopus crash on enter C:\
Opus is very slow - 100% CPU usage
100% cpu usage in >= after FTP operations
Dopus does not close properly, intermittently
Many crash and theme change?
Crash when Opening folders
Dopus crashing 10-20 minutes after thumbnails mode is used
Dopus crashing 10-20 minutes after thumbnails mode is used
Opus crashing when trying copy one lister to the other side
Opus crashing when trying copy one lister to the other side
Opus Locks Up - CPU Usage = 99%
9.1 hangs on Vista when browsing a DVD
100% CPU usage for version
Poor handling of large TIFs and ZIPs
Keyboard hangs when Lister is on HTML / HTM files Viewer
Opus 9:Few Of my Queries
Dopus 11 slow
DOpus 11 64bit crash
Crashing in XP due to PNG files
Crash at startup
Very Slow Responses
Crash error
Dopus really slow and DummyDllFunctionToAvoidSymbolConfusion
Thumbnail generation is very slow with high CPU usage
Thumbnail generation is very slow with high CPU usage
Crash of DO direct after restore of groups
Slowdown while reading temp
DO11: intermittent stall on folder opening
Error message after selecting lister
Serious crash when opening a lister in DOpus 11
Directory Opus is slow when refreshing a folder or drive
Dopus Rename/Copy Crash
Can't Open Listers When IE6 is Open
Program error on networked drive
Crashes on 64 bit XP machimes
Directory Opus shutting Down
DO11: Flac files
DO11: Open new lister after few secondes in XP
Directory Opus freezing
Dopus crash accessing Network Shares
Program Error Encountered
Exception number: 80000007 every time
Opus freezes in win 8.1
DOPUS slow to regain focus
Launching Opus after photo download hangs Win8
Freeze/delay switching to thumbnails with Wacom tablet
DOpus 10.5.3
Changing folders when using portable version takes seconds
Directory Opus "Not responding"
Crash in x64 Beta
Opus freezes and takes forever to load
Slow folder reading after installing Archicad 17
Folder Tree "CRASH" in Folder Path: Path (Basic) option!
Freeze on Win8x64 [in Explorer also]
Thrashing disk
DOpus performance problems
Version X64
DOpus random crashes
Directory Opus 10 hangs
Program Error Encountered problem
Opus is very slow in displaying large folders
DO hangs on a particular folder
DOpus keeps hanging
Crash When Browsing Large Folders
New Bug? Memory leak?
Frequent Lockups, empty tabs (iCloud related?)
Opus 10 hangs
Error from Microsoft Visual C++ Runtime Library
Dopus.exe uses 25% CPU (solved: wav file problem)
COM Surrogate has stopped working
COM Surrogate has stopped working
Frequently crashes since I updated to w8
Directory Opus crashing when moving folders
Limit to harddisks Dopus can work with?
Crash generating thumbnails
Encountered an Error
Crashes and hangs in Windows 10 Creators update
Directory Opus: High Processor Usage in Windows XP Pro- HELP
Directory Opus has encountered a program error
Extremely long startup time with huge memory consumption
Heavy CPU usage due to Intel Optane drivers
Intermittent 0xC0000005 error
Starting 2nd lister causes termination
CPU & memory high usage after using synchronisation
Loss of Drag and Drop & My Computer appears empty
DOpus has become unuseably SLOW over recent weeks to update the folder
Directory Opus Crashing
Opus freezing, Explorer slow
Android photos causing DO 9.5.0 to crash
Video folder and dimension sticking up, slowing up
Movie thumbs crash after Windows updates (was: DO 11 crashes on scrolling JPGs)
Thumbnails for .mov and .mp4 crashing after Windows updates
Crashes on startup
Opus is hammering my external drive
Opus crashes when I launch it
Opus crashes when I launch it
Find Not Working
DO starts up and freezes frequently -Have to use Task Manager to exit
Search window takes 135 seconds to display
Folders containing ACD Canvas .cvx files crash Dopus
Slow performance after V10 upgrade
Rename Bug?
Dopus.exe uses 100% of CPU
Bug with Recent Directory (also in File Explorer)
Excessive cpu util from dopuslib.dll!DoesExeFileContainZip
Dopus hogs memory
Opus Crashes
DO12: "Save lister and restart" and "Attempt to kill thread" not working correctly
Error oxc0000005
Dopus crashes on me
12.3.5 beta: High CPU use related to PDF files
DO is crashing randomly while browsing folders
DOpus bug: crashing when searching duplicates
Find files and Zip archive bug
Opus instability
DOpus v10.0.2 crashes and other issues
Opus is Unresponsive (Hangs) when Copying
Dopus not loading on my Windows 10 PC
12.3.3 beta occasionally crashes when opening a new window
Copy/Move queue causes DOpus 10 crashes
Crash once per day
Crashes with sounds are enabled
Sluggish folder browsing
DOpus 10 - USB Export - thread Error
Bug: folder tree not work properly, and sometimes opus crash
DOpus & Shell stop working / restarting after plug in / plug out USB drives
Folder format "Music" crashes Dopus
Explorer Replacement Crash in Do 10.x
Viewer freezing
Locked Directories
Selected Files & Folders Colors AND Slow Loading
BUG: Synchronise many Files / Folders
Dopus 10 (beta) crashes
How to remember tabs when opening folder from desktop
Opus 10 crashes each time I open it
DOpus 10 Crash whilst synchronising
CPU usage increase
DOpus 10 Crash whilst synchronising
DO11.19 Constant Crashing
Bizarre slow load of two particular folders
Recurrant unresponsiveness
Directory Opus Crash
Recurrant unresponsiveness
Directory Opus 11.18 x64 is running very slow
High Memory Usage
Opus 11 freezes
Dopus slow to open folders
Dopus crashes when opening folders using Listary
DOpus 11 slow
Slow folder browsing: Local and Network
Print / Export Folder Listing hangs
Crash at Desktop
"Reading Folder" on every folder (of all sizes) and it takes a few seconds
DOpus changes font size with Window 7 scaling
Slow on one machine (was: Slow after W10 Update)
Opus 9: Font Scaling sizes keep changing after Windows changes screen
Crash entering qsync folder
Tabs group behavior
Opus crashes after one operation in Windows 10
Is there a way to slow down large folders loading?
Very slow when I open a folder for the first time
DO doesn't load properly in new Windows install
DOpus using 5GB memory
New windows freeze if TOWeb.exe is running
DO slow performance in Windows 10
Slow performance when changing!
DOpus stalling out at random intervals... how can I help track down the problem?
Crashes on system that is also BSODing (Windchill Workgroup Manager)
Collections and huge memory usage
Serious instability with Alcohol image files
Dopus will be very slow to read huge OneDrive Folder
Pauses after descending into folders (Dropbox shell extension)
Viewing files and folders too slow
Momentary Lagging or Freezing
Crashing in 34 Seconds
Program Error Encoutered
Windows 10 Opus CPU usage is excessive at startup
OPUS locking up after over a year's use
Dopus locks up [solved by TortoiseSVN update]
Directory Opus hangs ocasionaly on right-click properties
5-10 second freeze when opening a new lister
DOpus 11 crashes
Dopus 11.5 Faulting
Opus crash thumbnail mode with this avi
Opus freezeing on first load
Slow network folder transits
Build 11.12 seems sluggish compared to prior builds
Directory refresh speed
Too slow to be usable
Install Update
List of FAQs organised by topic
DOPUS 12 not responding on Windows 10
Directory Opus 11.10 x64 crashes
DOpus freezes from sometimes
DOpus on Surface Pro 3
Crashing due to Solidworks
Opus sometimes hangs on launch if TortoiseSVN installed
Crash using Find starting from a Localized Path
Dopus takes a long time to show a lister window
Opus is locking up
Right click drag & drop stops working after network password prompt
Dopus freeze forever since latest beta installation
DOpus 12 hang randomly while opening the onedrive folder
Occasionally a random tab will hog all the CPU in 12.7
Crashes on a specific folder
Why does my dir opus use so much more resources all of a sudden?
Slow at opening directories
Opus crashes while accessing network folder
Problems with 12.6
DO suddenly very slow to display folders
Windows 11 and DOpus
Directory Opus crashes upon frequent refreshes from smb
DO 12 random crashes on windows 10
Progress indicators using CPU
Progress indicators using CPU
DO Crashes when scrolling in thumbnail view in find results
Thumbnail view eats up all memory in under a second
Opus crashing when eWallet 7 installed
Opus 9.5 Performance Issues
Windows 7 / Windows search / Or ? - Hangs after a while
Very Serious DO Shutdown Problems
Screen Freeze
Troubles with Dopus not starting
Directory opening slow - occasionally. Even on SSD
After last 2 update Directory Opus is (Not responding)
Crash due to gdimm_64.dll
New Version (12.13) Crashes upon Start, even after reinstall
Crash due to gdimm_64.dll
Directory Opus becomes unresponsive
Crashing when creating thumbnails
Directory Opus locking/freezing
Crashing after Windows update (Solidworks shell extension)
Unacceptable Performance
Help few problems
Lister Crash
Unexplained DO hanging
Slowly when open a folder, it take 2 seconds
Momentary Freezing in Windows 10
Crashing opening pictures folder
Hesitation opening folder & files
Directory Opus has been unstable every day forcing me to restart often
Interminable wait "Reading Folder" on SharePoint/OneDrive folder
DOpus slow
Very slow loading of directories (Opus 10)
Opus 11 not responding in Windows 10
D.Opus Freezing when I display the content of all subfolders
Dopus latest version so slow
Directory Opus is locking up after opening it
DOpus 11
Right Mouse Click Menu get always a Error!
Frequent temporary freezing
Crash at startup
DOpus freezes temporarily in win 10 when accessing network shares
Compatibility Issue of DO with Dragon Naturally Speaking > high CPU load
DOpus (and Explorer) display folders 1 per 30 seconds
DOpus 12.12 opens and immediately closes (64bit version, Windows 10)
What have you done to this wonderful program?
DO not responding on every action
Random keyboard freeze