Final Cut Pro 7 crashes when I play the timeline.

Question

I just update my MacBook to Mavericks and began experiencing the problem immediately.
Quicktime Pro 7 also crashes on launch after the update.
I have trashed my preferences and cleared caches to no effect.
Crash Analyzer identifies this line in the crash log as relevant:
3 com.apple.QuickTimeComponents.component 0x15dacdf4 CopyAndExpandStreamLayout + 49
Thanks in advance.
mh
I'm running OS X 10.9.2
MacBook Pro
2.3 GHz Intel Core i7
8 GB 1333 MHz DDR3
Intel HD Graphics 3000 512 MBS

Answer 1

I think I have solved it!
It seems to have been a QT7 problem that was crashing FCP7 (and probably causing a lot of other problems that I had not yet encounter.) I have a BlackMagic Media Express has failed after upgrading but I haven't had a chance to test it yet.
https://discussions.apple.com/thread/3211124?tstart=0
Here's the relevant post from NeutronJon:
NeutronJon
The problem:
So what this is telling us is that Quicktime (as well as iMovie, Adobe After Effects, and any other program that was using the Quicktime Framework) was using the QuickTime Framework that is located in /System/Library, which in my case was version 7.7.1. However, it was using the QuickTimeComponents.component file from /Libary/QuickTime (version 7.6.6) instead of /System/Library/QuickTime (version 7.7.1). Apple changed the storage location of the default QuickTime Components in QuickTime X, but not all applications have caught up with this change yet. When the Framework attempts to initialize and finds a function (_ValidateAudioChannelLayout) that is not available in the 7.6.6 version of the component, it crashes. This was also causing iMovie 11 to crash anytime I attempted to import a QuickTime video such as the ones found in iPhoto that I shot with my iPhone.
The solution:
Quicktime 7 for SnowLeopard will run using the version 7.7.1 of QuickTimeComponents.component from /System/Library/QuickTime, but it doesn't know to look there.
Using an administrator account:
Open a Finder window and navigate to /Library/QuickTime/
Open another Finder window and navigate to /System/Library/QuickTime/
(If you don't know how to get there, click Finder, hit Shift+Command+G for the "Go to" dialog, and copy and paste the locations listed above.
Select all of the .component files in your second window (/System/Library/QuickTime/) and drag them to your first window (/Library/QuickTime/).
OS X will automatically make this a copy instead of a move, and you will need to authenticate with your administrator password.