Thanks Dragan

Your explanation makes sense to me. I'm going to make a "ClearAllReleaseAllCloseAll.prg" and call it before trying to compile a project from now on.

Mike

>>I can't until I do a clear all. Credit goes to Wayne for pointing that out. Like I said to him, I don't understand how this suddenly started to happen.
>
>One possible explanation is that VFP is keeping a cache of classes in use, specially if you gave it a trial run between last edit and attempt of compiling. Clear All should clear the cache, and the vcx is not in use anymore.
>
>I used to get one of those once in a while, and it's become almost a reflex to type Clear All, Release All, Close All (or to use a cleaner like Terry does) when it happens.