Display-Color-Depth

Hi there.
After an application-crash (After Effects) and cold restart my monitor-color-depth suddenly switched from millions of colors to maybe several hundreds of colors. I've tried cleaning the caches, throwing out preferences-files (out of library) and also resetting the color-depth by using third-party-applications. Still not working. I suppose it's some kind of problem in one of the preferences-files in the library, but I don't know which one.
The "About This Mac" section shows that the monitor would show some "Millios Of Colors".
As I can not work like this I made a new user-account. In the new user-account everything runs smoothly but for sure I would like to use my old user-account with all my settings and preferences instead of switching to a total blank one that I have to modify again to fit my needs. Does anyone have an idea what could be wrong or how to succesfully force the display to display millions-of-colors again?
When I log into my old user-account the display first shows normally, then switches to "hundreds-of-colors" after a split-second. Is there any way to slow down this process and monitor which preference-file the computer is loading in exactly this moment?
Also weird: when I connect to my old user account via remote access / screensharing (vnc://...) then the display looks normal from the remote computer.
Any ideas would be welcome. Don't know what else to do...
Cheers, Aeiou

What does it say if you go to About This Mac -> More Info -> Graphics & Displays -> Pixel Depth
1: Try resetting the PRAM.
2: Go to System Preferences -> Displays -> Color -> Select another profile or calibrate
3: Go to System Preferences -> Universal Access -> Slide the Contrast bar all the way to the left
Might end up just being a plist to snag though.

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