I've seen it happen with other screens, but not with the 2010. If you change tabs, do they still stay black? They should change back when changing tabs.

This has to do with the order Mach3 displays bitmaps.

Have you modified the screen at all? If the bitmap order gets changed, this can happen.

What version of Mach3 are you using?

I'll look into it a little further when I get home.