It's November 9th 2015. I'm running Mavericks, I've just updated to the latest AE update.........I'm still having a ram preview issue. Most of the time it just doesn't play. I'm currently working on a music video which needs me to preview the Audio but alas, still after all this time the damm thing don't work. I've lost hours of productivity.
What, exact version of AE did you update to? I wasn't having much trouble with 13.5.1 on my Mavericks machine.
I presume you know about 1) not using compressed audio in AE and 2) AE CC 2015's new way of previewing.
In a word Yes!