My sister just had an access violation. So I cant say much about it...
Here is the Text:
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Total Commander
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Access violation at address 00603A56. Read of address 00000000.
Please report this error to the Author,
with a description of what you were doing when this error occured!
Continue execution?
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Ja Nein
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I asked her about it, but she didn't know much. We couldn't reproduce it...
So what I got:
She moved or copied files with the mouse. Perhaps also on the up arrow (parent directory) Then the violation occurred.
There are only the 2 Panels, no tree view or something else. Thumbnail Mode was activated at both sides...
I clicked yes (The cursor icon was still the "drag to copy" icon), Messagebox closed as expected, but the program didn't respond anymore. So I closed and reopened, and everything was fine. Also no file was harmed

Win XP SP2 Tc7b2
I wish you a nice chrismas this year