I was thinking that my Final Cut Studio 5.1 didn't work in Leopard because the ProKit Update 4.5 would only install on my 10.4.11 drive. Checked further today and discovered that my archive and install on the Cuda1TB had wiped the serial number so the clone of it to another drive via SuperDuper 2.5 was also without serial number.

Soon as I fixed that I could update ProKit Update 4.5 with Leopard Software Update on both Leopard drives. k