>>>Thanks. I tried FCompare and it doesn't work for me the way I wanted. I may try it now instead.
>>
>>You're welcome. Rick Borup was the first (of many developers) to recommend it to me.
>
>In the meantime I found the problematic folder, so right now I'm copying files from the "messed up" copy to the 'working' copy and rebuild all every time. I'm trying to find out the file which causes my problems. So far 4 files didn't produce an error.

Try WMATCH from PC Magazine.