I have the strangest error that I can reproduce regularly in Windows XP. I recently downloaded the latest update of Directory Opus 9 and now the program crashes when I surf to folders that contain PNG images. You might expect this only when displaying thumbnails, but it happens even if the folder type is disabled. Please help!
If it's when going to certain folders (or ones with certain filetypes), rather than when right-clicking, then this similar FAQ is more appropriate:
Crash, exit or high CPU when viewing a certain directory.
If you can narrow it down to a particular plugin, shell extension and/or PNG file then that makes it easiest to know what needs fixing/doing to stop it.