some of your problems sound familiar back in the day, what exact versions of software, drivers, quicktime, etc… are you using? Was it configured for you? Realtime, yes unfortunately, only refers to the native video format you are wokring in and any effects in the Effects tab that are in bold. No animation codec+alpha or anything like that. But yes, you CAN play back 8 streams of Uncompressed 10 bit at once (like an 8part picture in picture, with them spinning around, and maybe some color correction). …I know that the XRAID has been very buggy for people, I’d look around in the Blackmagic forum because they’ve seemed to found the specific working setup.
On your audio sync, are you listening to audio out of the Blackmagic SPDIF? We have a KONA card (same drivers as Blackmagic) and sound is ALWAYS out of sync on the monitor when you’re digitizing. But it will be in perfect sync once it’s digitzed. BTW, I don’t count this as a huge problem as our $250,000 Flame does the same thing.
The save problem is typically something I see if the project has been left open overnight/the CPU has fallen asleep/or you’re saving to a network drive that goes offline (even when you bring it back up, FCP doesn’t like to save). I keep a desktop folder for my project files.