I am having trouble with my 3870x2 card (visiontek). I cannot view any online videos (youtube, break, bofunk) in fullscreen. Either it comes up with a diagnoal line on the screen...or the screen just goes black...I can view DVD's fullscreen with no problem...play games at 1680x1050 with no stuttering...I am running ATI catalyst 8.4 and have had this problem since the 3870x2 has been released...
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