No Audio on MPEG Movies with 7.1.5

I'm sure there is a reason for this, but maybe someone can point me in the right direction. I seemed to have lost all audio output in QT for MPEG movies only. QT movies play fine, WMV movies play fine through Flip4Mac, but MPEG movies are acting really buggy and have now lost sound.
Any ideas?

I'm not really sure what kind of MPEG movie they are. How would you tell?Normally you would open the movie in the QT Player and then select the "Show Movie Info" Window Option to see what format is listed. "Muxed" format normally refers to MPEG-1 or MPEG-2 files. H.264 and MPEG-4 movie will usually list both their video and their audio compression format. If codecs are not shown, then the compression format(s) may not be QT compatible. Your original message implies that these files formerly played on you system. If true, then have you removed or added any QT components recently or done anything that might have modified your audio settings?

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