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Sounds like your CoDecs are busted. Reinstall Quicktime and check the respective settings. also remove conspicuous third-party CoDecs you may have installed e.g. from screen recording software or video chat apps.
Thanx so much for the reply!
Forgive me if I sound like an idiot but my knowledge of these things is intermediate at best.
I've tried uninstalling Quicktime but it doesn't appear to be possible as it say's "cannot be deleted as it's a part of the OS."
Should I just attempt to reinstall it? Also, regarding the codec suggestions; I have no third party video chats aside from Skype and no screen recording software that i know of. I do have multiple players like DivX & VLC as well as Perian. Could an update of one of those be the issue?
Again thanx for the reply. Please Bear with me as I'm REALLY trying to get this up and going again
Ok, I've uninstalled:
Perian- tried AE-crashed when I scrubbed & RAM previewed
DivX-tried AE-crash when I RAM previewed
Skype-tried AE-crash when I RAM Previewed & scrubbed timeline
Wondershare-tried AE crash when I RAM previewed & scrubbed timeline
The only video apps I have now are VLC, QuickTime (which I can't unistall apparently), & Final Cut Pro-X, & AE CS5. Any further instructions would be so GREATLY APPRECIATED!! I've just landed a HUGE contract with the local HighSchool dist as well as a job with a certain high-profile shoe company THAT IS TOTALLY DEPENDENT on my ability to use AE!!!
I deleted one more app (an AVI-DVD converter) NOW IT'S WORKING!!
THANX SO MUCH!!!