Solid Boxes sometimes not working

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I recently upgraded my 3d card and I've noticed some odd behaviour with boxes (2d boxes). Before the upgrade there was no problem, but now some of the boxes are see-through. Oddly enough, other boxes using the exact same syntax are filled correctly.

This one works......
Color 0,0,0
Rect 300,200,GraphicsWidth()-600,GraphicsHeight()-560,True
Color 200,200,200
Rect 300,200,GraphicsWidth()-600,GraphicsHeight()-560,False


This one doesn't...... (it's see-through)
Color 0,0,0
Rect 200,200,624,348,True
Color 200,200,200
Rect 200,200,624,348,False


I don't think my gfx card is the problem because I'm using the latest drivers (updated recently). Is this a problem with B3D?

Oh, obviously the 2nd box is just to put a white-border around the black/solid part.