Well I first would open Disk Utility and do a "Repair Permissions". Also I remember reading somewhere the current VLC beta plugin is playing havoc with some systems. Plus try to Reset PRAM to see if that helps. Good luck.
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PowerMac G5 Dual 1.8(Rev A.), , 7 Gig RAM, Pioneer DVR-110, ATI X800XT, OS X 10.4.11 & 10.5.5, 23'' HD LCD
Mac Book Pro Core 2 Duo 2.16Mhz, SuperDrive, ATI X1600, 2GB RAM, OS X 10.5.5
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