Little correction about my last reply.
QuickTimeComponents.component in both locations beneath should be version 7.7.1
and all will be up and running. Solved problem with Keynote large files and Compressor 4 crashing at startup!
Well, many many thanks to who ever sorted this one out.
Just bought a new 2012 Mac Mini and migrated everything over and still Motion 4 and iMovie crashed.
I found QuicktimeComponents.component 7.7.1 but it wasn't where it should have been.
There seems to be more locations for QT on the new system than the MacBook Pro I user where it's never been a problem.
Anyhow, I've replaced the old versions where ever they were (I use Devon EasyFind to find it system wide) with 7.7.1 and wham! All working again. And here I was, after several consults with Genius' at my Apple Store, I'd done something by enabling DTS passthrough with Perian
All fixed now and I just wanted say MANY THANKS to the original solution provider. You just made me very happy indeed.
I run into the same problem, after installing Quick Time Player 7 (Pro) on Mountain Lion. I followed the instructions above - I copied the component files from the Quciktime Folder of the System Library into the Quicktime Folder of my User Library - but even after several trials without any success. I am still getting the error "Dyld Error Message: Symbol not found: _ValidateAudioChannelLayout."
I originally copied Quicktime Pro plus its components from a back-up disc onto Mountain Lion. They might have replaced components for Quciktime 10. I am not sure if this adds to the issue. Are there are componetnts or other files that need to me moved or changed?
I appreciate your advise.
After the initial crash and the solution I found, I updated both Mac OS X and Compressor several times. I never had the problem again.
It is good to understand that Quicktime 7 and QuickTime Player (Mac OS X) are totally different.
And my problem was not related to QuickTime 7 (Pro) but to QuickTime (Mac OS X).
Why didn't you install QuickTime 7 from your system DVD?