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Since a few days, i have a limited Screen resolution, resulting in a black bar on the top and the bottom of the screen. When starting up in safe-boot, there is no prolbem. The display dialog let's me select the correct resolution 1920x1200, but beneath ther is written "Usable resolution 1920 x 1080"

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What sort of monitor do you have, and what kind of cable connects it to the Mac? – CajunLuke Dec 24 '10 at 18:28
up vote 1 down vote accepted

The reason are two displays (one tv) with "mirror displays" ticked.

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