Graphics problems with my second monitor...

Ever since I updated to Lion, I get some display problems with my second monitor (a Samsung LED XL2370).
Single windows appear darker and with bad graphics, especially when dragging from the normal monitor to the external one or openign them..
And after 'waking' my MacBook from sleep today, the background image of the normal display was missing. It was just a grey screen, but perfectly functional. And nothing changed when I checked the display settings and tried changing the background.
Any ideas??
A screenshot with both problems in it.. Acrobat Reader was sitting between two monitors, the right display is the external one

After 10.7.3 i was optimistic apple finally fixed the bug....but it seems that they were not successfull or just didn't care....
I'm seriusly really sour about the rapidly decreasing quality apple delivers.....thinking more and more about switching back to linux again....

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