I just upgraded from Mountain Lion to Mavericks in order to be able to use Motion 5 (the App Store won't allow you to buy it unless your machine is running 10.9.x). Before I upgraded, I did the necessarily Googling to confirm that FCP7 still worked okay under Mavericks.
Everything seemed OK after the upgrade, but for one problem - FCP7 now regularly loses AV sync on playback. On the plus side, it only happens perhaps 50% of the time, so if you start playback and you're out of sync, just stopping and restarting playback will fix it.
I'm not using any third-party cards or anything like that, my media (ProRes 422 and XDCAM HD422) is on a Thunderbolt hard drive connected directly to my iMac. If anyone has any ideas for a permanent fix (dropping back to Mountain Lion isn't really on the cards now), I'm all ears :)
I've read a few posts that FCP7 and Maverick is not good. I'm in the same boat, I have some software that wants Maverick but, I'm a "Get off my Lawn" guy and not leaving FCP7. So, my fix was get a 2nd computer just for Maverick and those programs. A little more work, but safer.
on Apr 13, 2014 at 8:59:15 am Last Edited By Gareth Randall on Apr 13, 2014 at 8:59:50 am
And now it's working fine all the time. I think the problem may have been that I was using Soundflower in conjunction with AU Lab to apply EQ to the system audio output to compensate for the rather bassy headphones I have to use. With Soundflower off, AV sync is solid every time. I'll just have to get used to bassier audio :)