Hello, I’ve been having the exact same problem – I’m running 10.4.11 / FCS2 with the latest ProApps update 2008-04 and QT 7.5.5. I have a thread on this issue on Apple’s support site as well, where other’s are experiencing the same problem. I’m running a Quad G5 4GB RAM.
I believe the problem actually started for me when I installed the 2008-03 update, so I’ve been searching endlessly for an archive of the 2008-02 update so I can try reinstalling from scratch and updating to 2008-02. Unfortunately, Apple doesn’t let you download past versions of the ProApps updates. >:-[
Here’s the Apple support thread link. Please add your comments to it!
https://discussions.apple.com/thread.jspa?threadID=1786371&start=0&tstart=0
-Bryan