I wonder why Acrobat 8 seems to work. Maybe it is something peculiar to a G4 and it is different on an Intel machine.
BTW, the Leopard install went perfectly on one G4 laptop (install and archive) but on the other I had to do an “Install and erase” to get it to work. However, given all of the trouble others have mentioned about running FCP and After Effects with Leopard, I am not installing Leopard on my Mac Pro (8 core) until these issues are addressed. That said, I am dying to know if the new OS makes FCP and Compressor, Motion and Soundtrack Pro run faster and use more of the processing power.