Hi Kirk,
While i do not suffer the crash as described, I have noticed something really strange too. When launching NX2 from PM, NX2 opens just fine and starts loading the specified file. This, however, does not finish and the frame for the file stays empty. Quitting NX2 and then starting it from the dock and then editing the file from PM, works just fine. So somehow, the way PM starts the editing app is slightly different from simply starting it manually (even when dropping a file on it).
This behaviour seems pretty reliable (albeit incorrect) and, to my knowledge, has been the case for quite some time.
Hope this helps you find and fix the problem.