Cannot play video in Safari after upgrading to QT7.5

The video frame just shows a Big Q with a Big ?.
Can anybody help please?
Thanks a lot!

I'm running Tiger, and it has happened to me, so it probably isn't the OS 10.5.3(?) update.
I updated the quicktime software, and then started to notice the same problems. I didn't have EVERY multimedia icon appear as a 'Q' or '?', BUT I did see many, many more than normal. I saw it in Firefox, and Opera, too.
Now, here is where it gets strange. When I hit the reload button, more and more of the 'Q'/'?' icons changed to what they were intended to be, with more of the intended icons appearing after each reload of the same web page.
But, after I deleted the Safari and/or Firefox cache, history, and cookies, the same 'Q'/'?' icons appeared. Again, after clicking the reload button the intended icons would come back, one or two with each successive reload.
Then, I remembered I had Opera installed, so, I deleted the history, cache, and cookies of EVERY browser on my machine, and closed all applications.
Finally, I ran a program that checks scripts, cleans up the system, etc. (Disc Utility may be fine, but I used one of the maintenance/cleaning programs available in 'Downloads' on this site - if you can't see the icon it's the 6th icon on the top of this page, counting left to right.)
Everything seems to be working alright, now. Sometimes repairing scripts or permissions, or deleting application caches seems to help purge whatever programming overlaps, or bugs or whatever ghosts slip into my computer at night. Good luck, and I hope you don't have to do a clean install.

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Cannot play video in Safari after upgrading to QT7.5

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