Periodic Inability to Watch Videos in Safari Till Reboot Since Lion - Help?

gosh - hope can me this. can't take anymore.

periodically, no apparent reason, lose ability watch videos. cnn, facebook wall, youtube, everything. way fix reboot. don't think i've tried opening/closing safari. rebooting means have spend several minutes putting safari windows in darned desktops in.

i've tried removing adobe flash , reinstalling. yes have current version. way i'm able watch youtube due setting html5. still can't watch else when (often).

fine, 1 minute - can't watch videos. blank. can please give me suggestions how fix this? i've been living several months since lion. thx!

core i7 imac. 16gb memory

 

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