Hi Mark
I upgraded to Leopard 3 days after release. No noticeable issues with any Studio apps. I do have some QT 7.3 related issues with iWork. I haven’t done any thorough testing, just continued working on some non critical projects in Final Cut.
The route I took was — remove all traces of APE, clone drive, and upgrade ( not erase, not archive). and it worked, even my AJA Kona LSe without new drivers.
Hope this helps
Terry
MAC Pro quad 2.66, 5GB, 2x250GB, 2x750GB internal RAID, X1900, 23″ ACD, 10.5.1, FCS2(FCP 6.0.2)