Any of you who do use quartz compositions in your visuals who haven't yet upgraded should be aware of a major change in the system.
All quartz compositions exported through the quicktime player (or simply opened as is in modul8) are forced to run in a new "safe mode" which basically disables a whole lot of important patches that can pose a security risk on the system.
Among them, Audio Input is disabled. MIDI input is disabled. ALL 3rd party plugins are disabled. There is no "disabling" safe mode either.
I've been following discussion on the QC mailing list and apparently the only way to get these functions (I'm aware of) back is to "wrap" these patches in a plugin and then use a hack to make 3rd party plugins pass the safe mode. This of course opens up your system to major security vulnerabilities.
In short, upgrading has totally f.... me. I used audio input and midi in quartz comps a lot. The only reason I upgraded to Leopard in the first place was to be able to take advantage of the new version of QC, and now I find it's basically useless. There is no mention of this new safe mode in the Quartz release docs, I guess I should have researched more.
Excluding Quartz, everything still runs fine and dandy, the only other exception being that a few of my favorite Pete's Freeframe Plugins don't work anymore. But only four or five of them.