Overlapping wallpapers on external monitor w/mountain lion

When I close the lid on my early 2011 Macbook Pro with my external monitor pugged in via a thunderbolt to displayport adaptor, the wallpaper from the macbook overlaps the different wallpaper on my external monitor. This has only started to happen after upgrading to Mountain Lion. Any ideas on how to fix this?

I have been experiencing this, but with Lion, not Mountain Lion. It is driving me nuts!
I am using LG L246WP monitor via HDMI to DVI on MacPro1,1. I have tried changing cables, even tried VGA to DVI (no blackouts with VGA, but not sure I can trust that, because there is no set pattern of when it will blackout!).
I did try another monitor for most of a day - no blackouts/flickers, and as soon as I hooked up my original monitor, I got blackouts, which led me to believe it is the monitor.
I have searched and read several forums on blackouts, each with different configurations, so at this point I am not sure what it is. I even replaced my Graphics/Video card, because someone on Apple forum said most likely that was the culprit, but still having same problem (even as I type this!).
It is like something is intermittently interfering with signal???

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