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hydseek Looks like it is really a bug that occurs with Leopard OS. I have reported it to our QA team for investigation. We shall try to fix it...
hydseek, Please go to System Preferences->Mouse and Keyboard->Keyboard tab and make sure option "Use F1-F12 keys to control software features"...
hydseek, Please try pressing Alt+Fn+F11 or holding down Alt and then selecting Actions-Send keys-F11. Best regards, Aurum