For quite some time I had windows XP installed and everything was fine.
Then I upgraded to windows 7 and everything was still fine.
Then few days ago I installed newest Ati drivers... (I have Ati Radeon HD 4800)
And that's when the exact same thing happened to me. I struggled for days, but all I had to do is turn off the "Antialiasing" option in KB, and everything returned to normal. (Except, off course, now I play without antialiasing)
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