Clrmame 3.61b hung when I had corrupt zip files in my add directory and clrmame was trying to use those corrupt files to fix my roms.

The status window at the bottom of the scanner window showed that clrmame continually tried to open the bad zip files with the message "corrupt zip file " then some kind of header error noted (sorry I did not write it down - was like no recognizable header structure or something like that. The roms in the fix path had just been rezipped with mamezip.jar)

I let clrmame cycle like that for about 15 minutes before finally cancelling the scan.

No complaints here. Just letting you know about this.