Simulink Crashes 2015b VNC

I just started using the 2015b pre-release and I am finding the Simulink crashes when I try to launch it.

I am using VNC for my desktop and the crash seems to have something to do with VNC server. I have tried multiple versions of VNCserver and all show the same issue. I do not see the same issue in 2015a. Using NX I can get Simulink to start without issue.

Tech support mentioned VNC is not officially supported. Where do I even start to try to debug this myself? I have tried a few of the command options like matlab -debug and didn't see anything useful.

Attached is my crash report.