After Effects Render/Playback Issue?

on top of line mac pro , 2 new 27" imacs having issue ae stops rendering , playing back. when glitches gets stuck on last frame on when scrub change black frame on when glitched. if try playback doesn't start moving playhead , no matter place playhead , won't render frame or show has. can set render when hit render button sits @ first frame , won't render anything. issue persistent across multiple different projects. re-opening ae fixes issue temporarily i'd resolve issue.

things i've tried resolve issue are,

purging cache

purging all

resetting preferences

re-installing aftereffects

i talked adobe 45 minutes no avail , don't see similar on forums. if has ideas or suggestions try i'm ears.

 

the on mac osx 10.10.5 , using after effects 2015.

 

thanks.

ditch ae cc 2015 time being -- it's notorious train wreck.  cast jaundiced eye on pololyanna-like claims upcoming bug fix cure-all.  adobe's recent track record isn't best in world.

 

you're on cloud, ae cc 2014.  works.

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