Quicktime on some websites is playing with a blank white screen with audio

I am finding that on some web sites quicktime sometimes plays improperly in Firefox in a recent build. I get a blank white screen but the audio still plays. I have spoken to others who are experiencing the same issue.
The issue will sometimes resolve itself if the window is resized, the scroll bar is moved or the page is refreshed. The later only works occasionally.
It is not occurring on the machine that I'm writing this from. It is happening on both PPC Macs as well as Intel Macs.

They only charge you the $49 for talking to someone on the phone, which I don't recommend anyways because lots of times the machine needs to actually be looked at.
I would reserve an appointment at the Apple Store Genius Bar. They DO NOT charge you even if you don't have a warranty. They only charge you if you want them to fix it for you, not for the actual diagnosis of the problem. If you can fix it yourself, they can show you for free and you can do it.
If you want them to fix it for you, they will charge you for the labor, not the actual appointment.
http://apple.com/retail/geniusbar

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