In reply to Maurice, yes, Mountain Lion is 10.8. In my post I mistakenly typed 10.6.8 which is Snow leopard.
For now I'm sticking to Snow Leopard. Did a ground-up reinstall and my FCP7 set-up runs perfectly again. Happy, happy!
If I had time (which I don't) it would be interesting to try a complete re-build of a Mac Pro with Mountain Lion, then install FCP7 and FCPX from scratch. I suspect that may work. Some people are saying they have no probs, but when I tried it as a upgrade (rather than a re-install) it was a mess.
Another problem with 10.8. was that my Blackmagic Intensity card would not output pictures from FCPX to my monitor, despite trying the latest drivers from BMD. This was my main reason for upgrading to Mountain Lion in the first place - I wanted to try out FCPX, but monitor output apparently only works with 10.7 onward.
Does anyone else have any experience with FCPX and Intensity cards?
Im finally running Final Cut Pro 6 on Mountain Lion perfectly fine. I first backed up my Mac, erased my Mac HDD and installed SL. I then installed Final Cut Pro 6, I searched for any updates for FCP6 and SL as well and did all updates available. Then upgraded to ML everything works fine, Im happy. Also, I installed Snow Leopard in an external HD, installed FCP6 just in case didn't work, but it did so far so good. If any body bought a new mac with ML, FCP6 is not going to work unless downgrading to SL install FCP then upgrade.
FCP 2 is not compatible with Lion because FCP 2 runs only on Power PC Macs.
Assuming that you meant FCS2 (Studio 2) then this is incorrect. FCS2 will run on both PowerMacs and Intel Macs. Numerous users have FCS2 on Lion systems.
FCP2 requires a 300MHz or faster Blue & White PowerMac G3 or PowerMac G4 system (available around the turn of the century) but only on MacOS 9.1 or later. It was not certified to run on OS X in any version.