Hi Kevin,
I am having similar issues as reported in this thread. Here is my Mac Pro info:
Mac Model: Mac Pro Late 2013
Memory: 32 GB 1867 MHz DDR 3 ECC
GPU: AMD FirePro D700 6144 MB
Premiere Pro version: Creative Cloud (Latest Release)
Storage – local vs network: Network
3rd party IO?: AJA IOXT
Dual monitor GPU?: Yes
3rd party plug-ins loaded?: AJA IOXT
Type of footage?: P2 footage
I don’t currently have a crash log and I turned off GPU rendering. Since turning it off, the machine no longer crashes but it runs slow for exports and the audio playback through the IOXT cuts in and out. Very disappointed in apple right now.
-Matt