weirder still...
I have the same problem except with, Safari, Firefox, and Internet Explorer. First I noticed it with Safari. I reinstalled Flash 9. Great, all was well. Then after a few hours on the net, suddenly QT logo with a question mark in the middle, again. I checked Firefox and ditto. Checked Explorer, same problem. Tried updating, and all earlier suggestions, (system prefs, QT preferences etc.) I have uninstalled and reinstalled till I'm blue in the face. I repaired my disk verifications hoping that would help but nothing.
This has happened several times over the past few weeks and reinstalling seemed to help for a few hours, but now I can't seem to fix the problem. I really dont know what I'm doing, just pushing buttons hoping to hit the right one. Please help.