UPDATE. Weird things with Toast Titanium 8 in my Leopard:
1) Although it works with Rosetta, I've got a crash in the middle of a recording session :-(
2) Neither the companion utilities work. They say: "This application requires Toast 8 Titanium or later to run on your system. The application will now quit.". Strange!.
3) I've read that Perian and other QT components could be the culprit, but I've uninstalled perian, removed some QT components, and still no luck.

It's like I'm giving up on this...