Leopard Media Problems

I have some issues with Media Players and programs, they happen on Zephyroth's 10.5.1 RC2, 10.5.1 RC2 + Update and full 10.5.2 installation.

The Leopard DVD Player isn't accepting mounted Video DVD images. If it detecs one (even if it's later mounted) it simply quits. There are no error messages, Console only says 'Exited with Exit code 1'. The same is on FrontRow and on MediaCentral which is not from Apple, so it could be a global Problem. I can only watch DVD Images with VLC Player which brings its own codecs.

It's also curious that FrontRow 1.3 isn't working on 10.5.1 RC2 and higher. It was working without problems on the 10.5.1 RC1 DVD after the usual patches. Now it hangs after you selected the Video option for the second time, later it shows 'an unexpected error occured'. But it doesn't crash. iMovie '08 isn't working too, it quits unexceptedly (on 10.5.1).

Toast 8.0x isn't working on RC2 too, Popcorn 3 should also not work. In some forums I read that there were problems with Perian or an Xvid codec but it was not possible get it working, even after removing ALL Quicktime components + reboot.

These are all programs which have to do with media and Quicktime components. Does I have to fix something in my system? I'm using Quicktime 7.4 / iTunes 7.6 on 10.5.1 and 7.4.1 / 7.6.1 on 10.5.2. They are unpatched, either the versions from the DVD or from Apple Software Update. I want to use Final Cut, but if it is a global problem with system / quicktime media components then this would be bad.

Other things:

For users of the wave editor Amadeus Pro: Versions before 1.2 won't run on Leopard. But the trick is easy: Download the trial (1.2.1 is actual) and start it. After this the old 1.x ones will work again. It's a great program for wave editing, test it.

Users which have problems with Quark XPress 7 should start the 'Quark XPress Components' Installer in the 'For System' folder. This should make it work again. They are some 7.3 versions in the net.

iWork '08, iLife '08 (except iMovie), MS Office 2008 (it's crap), Adobe CS3 Design Suite and so on are working without problems.