Two different late model (but not 5K) iMacs with have consistently been hanging or crashing on exit since upgrading to SU OS X 2017 from 2016. The problem exists on existing files or new (i.e., new file > draw a rectangle > save > exit > crash). I’ve turned off all extensions, but the problem remains. Tried different templates without success. Tried starting SU while holding down shift without success.
The fact that two different iMacs (one 21.5-inch late 2013, the other a 27-inch late 2013) are exhibiting the same problem leads me believe it’s not a corrupted preference file. Both have NVIDIA GPUs.
I’ve submitted several crash reports.