Does anyone else use FCP7 with Studio Premium in Yosemite ?
I upgraded to use a new gfx card, and now find that the RT Enabler no longer works.
It is selected in the prefs but FCP7 forces render on all effects.

FCP7 is not officially supported in Yosemite - you'll find lots of things 'break' as you change things or upgrade. I had similar problems with Yosemite and eventually I gave up with FCP 7 on that hard drive. I have a triple boot system on a Mac Pro and keep a Mountain Lion drive just for FCP7.