>Hi Al - it has been something that has plagued me since I first used vfp in 1998, so I don't think it is anything in my environment doing it. I am, just surprised nobody else seems to know about it..

I would get something like that from time to time long ago in the VFP5/6 days. What seemed to set it off for me was using the mouse scroll wheel to move up/down in code, then click on the scroll bar to try to go up or down one screenful. That could cause things to bounce around unpredictably.

With VFP9 and modern mice and mouse utilities I can't recall seeing that behaviour.

I do take pains to make sure hardware drivers (mouse, display etc.) are exactly correct and up-to-date, it might be worth checking your system.