Indeed, sync is a problem.
I checked with the Apple store folks (one of whom is fairly knowledgable about video) as well as some other sources that said FCP7 will work with Mavericks. And, it does…sorta.
My audio is delayed going through an UltraStudio 3d box…but not when using built-in audio. Blackmagic says they are aware of this and suggested changing a different version of Desktop Video…but this has yet to work.
My issue is that I wanted to update Motion, as well as a couple other things that needed Mavericks. I had planned to set up a second partition, etc…but didn’t. (Another example of thinking “it’ll be fine” and paying the price of not taking the additional step)
I’ve also downloaded a trial version of FCP X….which does sync fine.
We’ll see what Blackmagic comes back with today…