Black Screen of Death & OpenGL Question

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' cls.bmx

' a spinning text message
' remove the call to cls to illustrate the
' need for clearing the screen every frame

Graphics 640,480
SetOrigin 320,240
While Not KeyHit(KEY_ESCAPE)
	Cls 
	SetRotation frame
	DrawText "Press Escape To Exit",0,0
	Flip
	frame:+1
Wend


Unfortunately I have this screen problem with the majority of programs I have tested. Maybe it's something wrong with my video drivers or refresh rate.

Thanks.

Edit: Or could it be the demo version?

Edit2: I'm even getting it with this kickass tutorial. :(