>Hello All, I know this sounds weird ( it is ) but !, I just installed an app on eight different PC's, it's a simple address edit screen with some textboxes and three buttons, on seven of the machines the screen behaves and looks as intended, on the eighth however two of the buttons are missing ! there's no code hiding or showing the buttons and all the form is visible, any idea what's going on here ?

Possibly its the video drivers on the machine that the controls disappear on. Try reducing the video accelaration and/or updating the drivers.