After having installed the new Adobe 2014 update AND Apple's 10.9.4 Beta OS it has cleared up my rendering issues with PP CC and the New Mac pro- However I am also having audio glitches on playback of the timeline.
It persists whether I render the sequence or not. It is VERY annoying and makes it very difficult to edit audio. So unfortunately the BETA OS 10.9.4 did NOT address all the PP CC / nMP problems!
