It seems, that ClamWin creates occaisionally clamtmp files during scanning and includes virus signature like code inside.
This signature is detected by some other virus scanner (avast) effectively stopping ClamWin until I advise avast to not do anything with the clamtmp-file.
I would not want to disable avast on the temporary folder, as internet stuff first goes there, too.
And I would not want to disable avast on files ending with clamtmp as some virus writer could then have an idea...

If you can exclude files/file types from your Avast scans, I suggest you exclude *.clamtmp.

This is a problem that crops up occasionally in ClamWin. I have a question related to the clamtmp files a couple of posts before this. According to the developers, ClamWin is supposed to clean/police up these files at some point, but I don't know at what point. I have accumulated a large no. of Clamtmp files a few times and had to delete them myself--they seem to get dumped on my hard drive when I stop ClamWin in the middle of scanning, so it appears that they are whatever ClamWin is working on when it is stopped. Some kind of script is needed to police things up--either automated or at the selection of the user.

This might work (not guaranteed), but I don't know what to do with it--the last script I wrote was in DOS (it would have to be changed for your default DocsSettings temp directory):

Const DeleteReadOnly = False
Set objFSO = CreateObject("Scripting.FileSystemObject")
objFSO.DeleteFile(�C:\Documents and Settings\Bob\Local Settings\Temp\*.clamtmp�), DeleteReadOnly

Regards,

On my computer, the temporary files disappear immediately after they are constructed, so that is not my problem.
It's just that I don't want to limit my on-access scanner as this would open up new possible holes.

sure you don't
but clamscan unpacks the virus db in temp directory before loading it so an on access scanner
will find it as a virus, just after it gets unpacked
you shouldn't exclude temp dir from scanning but just pause the onaccess av while scanning with clamwin