Tried on multiple machines and the issue seems to occur only on mac, not windows.
On a dual boot... a project with no 3rd party plugins renders on the windows side in 4 hours... on the mac side the render stalls out after 16 and shows about half done. Same scenario on another mac.
mac pro 2010 model
2x2.4 ghz quad core xeon
ati radeon 5870 1gb
Tried rendering to high speed san and locally to disk with same results. This issue seemed to arise with upgrading to OSX 10.9.5 mavericks and remains with 10.10.3 yosemite.
I've tried the cc 2015 as well with same results. This seems to occur with any large projects with long renders.. shorter renders seem OK. Multiprocessing is OFF. Most preferences are default. Seems like a bug to me since the issue disappears on the windows side of things.
Any help or suggestions would be appreciated... or if adobe is listening... a verification that that this is a bug and maybe report it.
Thanks for the response, but the problem is with the render stalling out and not the program itself upon startup.
The problem is occurring on multiple machines, some of which are clean installs.