I upgraded some things and Quicktime stopped playing MPEG-2 movies (black screen)!

I upgraded some things and Quicktime stopped playing MPEG-2 movies (black screen)!
I need help, I was ending a project and now it just plays black!
I have quicktime X.
HELP! PLEASE!
thank you.

Quicktime was working fine, I am not sure what Quicktime it was. I upgraded Java, I am not sure if I upgraded Quicktime. After that all quicktime movies with "MPEG-2 Video, Linear PCM, Timecode" codecs started playing black with audio in the background. iMovie was not used. Thank you, I am beyond desperate and I am starting to think no one can help me with this.
Then I am not sure how your created the MPEG-2/PCM MOV files. Files not imported via the MPEG-2 Import codec would normall remain in their long GOP compression format which it not edit compatible in QT based video editors. Those that are imported via the codec to make them edit-compatible then need the codec for proper playback in QT based players/editors.
Since you now say that "Quicktime is working fine," am I to assume that it is After Effects that is playing "black" screen videos and that the files play fine in the QT players? Since you also mention the files are time coded, am I to assume you used FCP or some other app to import the files (which may use the same sort of import workflow) or am I to assume it is the timecode data itself that you feel is now causing the problem. In either case, a Java update may have been a security update that is now causing your current issue by disallowing access to the required playback component for some unknown reason which Apple is unlikely to divulge if it refers to a software security risk.
If problem is general on your system, then do you have a short sample file that you can upload for testing purposes on my Snow Leopard system? At the very least, this may confirm if the problem is general to all updated platforms or local to your individual system and/or user account.

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