>>Christian,
>>
>>I seen you're using themes. I'll have to test under that. I'm running Windows Classic.
>>
>>One question, are you using something similar to the code I posted earlier. If I didn't know better, I'd say that the wrong window handle is being sent to the routine.
>
>
>I just tested at another Windows XP Home terminal, and it works properly. So it must be something specific on my machine that causes the problem and has nothing to do with the code.
>
>I remember having installed long time ago PC Anywhere, which messed up some parts in the registry. I uninstalled it and I had to repair some graphic drivers. This may be the cause?

It could be, but I'd be at a loss to explain why.