Yes - it seems like this RAM preview issue starting happening with one of the 10.9.X updates - I'm not positive which one since I held off on updating to 10.9.X for awhile and think I started with the 10.9.2 update. It's impacting CC 2014, CC, and CS6 for me. I'm working around it for now, but really hope the fix is released early. I needed to update for other reasons, so downgrading to my previous clone isn't a great option for JUST this issue. If there were other issues I couldn't work around, then I likely would feel differently and would have a dual-boot system for awhile. There are ways to do a clean install of 10.8.X even on an older machine, FYI. You can download a .DMG of the OSX installer and create a bootable USB flash drive then do a clean/fresh install of the OS. If you're working on a MacPro that can swap out drives/SSDs with ease, then it's not a HUGE deal as long as you have a spare around. If you're working on a "non-removable" drive, then setup a clone before you do anything. I have a clone with a working CS6 on 10.8 (think 10.8.5?) so would load that if totally necessary.
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