this worked for me and others (I have an intel mac), but since problem occurred after QT update, should work for powerpc too?- not sure which you had. just make sure QT 7.1.6 is for the right model. the combo update for os 10 is for both powerpc and intel:
From the Mac discussion forums:
http://discussions.apple.com/thread.jspa?messageID=4930170�
Try this: download and retrofit (force install) QT 7.1.6 using Pacifist, then run the 10.4.10 Combo Updater for Intel Macs. Make sure it is the "combo" updater. Be sure to restart in safe mode after using Pacifist and then install/re-install the combo update (while in safe mode). For all those "non-techie" people (like myself), please try this if you already haven't and please read the instructions for Pacifist - if you use Pacifist correctly, it will ask you if you want to replace (vs. update) all of the Quicktime components (yes, you want to replace), so you will know that you are accomplishing what you need to. The first fix I tried was just to reinstall the Mac OSX10.4.10 combo update for Intel Macs and this did not work, but when I used Pacifist and then reinstalled the MacOS X combo updater (do not get this confused with the update that is not the "combo" one- (use the links), it worked! I am not a web developer, so did not have to deal with the Java 6 stuff.
Combo Intel update is here:
http://www.apple.com/downloads/macosx/apple/macosx_updates/macosx10410comboupdat ev11intel.html
QuickTime 7.1.6 is here:
http://www.apple.com/support/downloads/quicktime716formac.html
Pacifist is here:
http://www.charlessoft.com