No Audio on MPEG-1 files since upgrade to 7.0.2

I recently upgraded to QT 7.0.2 as well as having to re-install DVD Studio Pro 3 (and did them in that order). I have QT Pro.
Since then I can't hear any audio from Muxed MPEG1 files (so, lot's of stuff online) although the EQ meter in Quicktime is still registering the sound. Additionally, the MPEG1 files playback really choppy and usually freeze (the image quality looks a bit rough too).
All other formats are fine.
I do have some DivX components, but had removed them. FYI, this is the list of components installed (including the DivX ones):
3ivx D4 4.5.1 for OSX
AC3 Codec.component
AppleIntermediateCodec.component
DivX 5.component
DVCPROHDCodec.component
FCP Uncompressed 422.component
FFusion.component
LiveType.component
Toast Video CD Support.qtx
I have so far tried:
Using the 7.0.1 re-installer (no joy there)
Re-updating again to 7.0.2
Removing the DivX components (no joy there)
Ensuring the Pro Apps update was installed (fixed another bug in DVDSP, but not the MPEG1 issue)
Ensuring the latest update of DVDSP 3 (don't have the need for 4).
Anyone got any ideas? It's a real pain.
(My next thing will be to roll back to QT 6) and work my way up again.

For me the fix worked at the 64KHz - 2ch/24bit setting (iMac G5, 1.8GHz, 768MB RAM, QT7.0.3).
But, I must say, it's quite unacceptable on Apple's part not to make sure to notify those who update to 7.x.x in good faith and trust that there is this tiny change needed in some settings. I spent several hours downloading re-installers, trying to roll back to QT6.5.2, and then this wouldn't work, and I had to go back up, download third-party software to use with my muxed mpg's, and, while doing all this, suffer my first real (and frightening...) black-screen crash after more than a year of use.

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