Running FCP 6 under Tiger (latest everything) and RED 4.3.1. Oddly now, if I render a RED filter or gernerator, FCP won't play anything back except odd grabs and splutters until I close and reopen FCP. Then everything plays back fine.
This doesn't happen on FCP effects, even if they are applied to a Boris clip.
Any ideas? I have a deadline and this is driving me nuts!
I don't know why this is happening and I doubt that we'll be able to resolve this in time for your deadline so in the meantime I'd suggest that you do the work in the RED Engine, render a result, and then import the result into the FCP timeline. I know this is not a resolution for the problem that you describe but you really need to contact tech support for that - it's just not something that I can help with. You should contact them via email at email@example.com.
I wish I could offer better advice but I have nothing better to offer than what I have listed above. John from support can assist you in resetting your system as it sounds like there is some sort of installation issue which is causing the problems that you are seeing.