>I have a screen that is pretty complicated, has a lot of controls on it. Weird thing is that on a couple of machines, if the users moves the mouse over it - all the objects on the screen disappear? If they know where to click and it causes the screen to refresh, then they all come back (kinda) - does anyone have a clue as to what could be causing this and how to fix it?

Turn Themes off.

_Screen.Themes = .F.