John,

> Thank you very much. I'll give this a try. Did your problem only
> occur in D7 using pre-XP versions of Windows?

It only occured with D7 and after one of the first Service Packs for W2K. I
have never used XP, so I wouldn't know anything about that. As it often
goes, I had changed some things in my application at the same time I applied
the service pack, so I never made the connecion. It was only after some
comments in a newsgroup that I tried the patch.

Florian