I haven't had it happen for a while, but then again I have not been using my PC much lately. Although it is not reproducable at will, here are some answers to your questions:
A. What have/had you been doing before or when you saw this problem start?
It typically happens when I go 'Up' from a folder, then I start to notice that opus and the rest of the machine is going slowly.
B. What else is running on the machine.
ZoneAlarm (with Anti-virus), Privoxy, not much else.
C1. We have seen cases where video codecs can cause strange problems. Have you been viewing video files or folders with video files? If so then disabling the movie plugin should solve the problem.
In my case it is not related to the movie plugin - I was not viewing movies and I also have the plugin disabled.
C2. Remember that the movie plugin is also used to get information fomr the file to display the details in the normal file display columns so you do not have to actually view the movie.
At least in the last couple of times it happened there was no movie in the current folder - in fact it is often the root of C:\ where it happens.
C3. Also try disabling the Listers - Thumbnails - Use shell image extraction for formats Opus does not understand.
This option is not enabled on my machine. I also do not use thumbnail mode.
C4. Check the columns that are being displayed in the Lister. Apart fomr size and dates etc, do any of these access the file for descritions or other details of the file
I use only Name, Size, Attributes, Modified date.
D. We have one other user who has reported such an issue but apart from video files (and the movie plugin), we have not been able to trace this to Opus itself so it may be some interaction with some other library or application on the machine - such as Antivirus or AntiSpyware etc. Do you run any of these and does disabling them help?
Yes, I run ZoneAlarm with antivirus. I can't tell if it helps to disable them because I never know when it will happen. I will try disabling them and let you know.
At least for the last time it happened, FileMon shows the results posted in this forum, and that I sent to you.
Regards,
Simon.