No, but it is specific to certain forms...

>>In only some cases if I create a popup messagebox() form and when it is displayed, move it around the screen, it will effectively 'erase' the form behind it. It does not happen in all cases and I can see no 'activate screen' or other command that may have an effect on this. What else can cause this?
>
>Does it make a difference if you play around with your video settings:
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>- in Desktop...Properties...Effects, try turning off "Show window contents while dragging"
>- in Desktop...Properties...Settings...Advanced...Troubleshooting you might play around with the hardware acceleration level