Yeah, the "dragging" is what you see with lockscreen=.f.
Is your form affected by any WinAPI functions altering its appearance or other properties?
What version of Windows? Is it WTS?

>In testing when I set lockscreen to .T. on the background form to see if it caused it to occur on other forms, what happens is the messagebox form image is drawn all over the form in the background when you drag the messagebox form around but it doesn't erase the form in the background. On this form, it is the erasing it (it becomes blank everywhere the messagebox is dragged to but the messagebox image does not get left there) in the background that is strange. I don't get the messagebox image dragged all over it at all...
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>>It means that Form.Lockscreen = .T. while the msgbox is displaying, which prevents the Form from repainting. Make sure that Form.Lockscreen is .F. before displaying the messagebox().
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>>>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?