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QT used to play .avi - now only white screen with sound

Update:12-10Source: network consolidation
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My Quicktime Pro 7 used to play the avi files no problem.
Overnight, it plays only audio with white screen (on the exact same files).
According to QT info, the files in question use WMV Image Codec.
Why the change? How can I get my movies back?

The Best Answer

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Did you repair permissions & restart after the installation? If so, then check QT MIME Settings to make sure nothing has changed there.
See if VLC Media Player works in playing the .avi files.
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