5.6.0f1 Game crashes unless in development mode

My game runs fine in the editor, and in debug builds, but crashes in the middle of the Unity splash screen in 5.6.0f1 and also 5.6.0b11 in release builds.

Here is the crash output:
https://drive.google.com/file/d/0B7Y9BgPV7guRQzNORlpaUGQxTkE/view?usp=sharing

Please let me know if there's anything else I can do to help.

 

The issue was a single plane in my scene, with no scripts attached, only a substance material. Recreating the plane and attaching the same substance material to it seems to have fixed it. The only change on the substance material was "Bake and keep" rather than the option that generates it on level load.

 

I believe it would be from advantage, if you can create a small project that triggers this crash and submit it via the bug-reporter, following these guidelines. Once you submitted a bug-report, you receive a Case # a few minutes afterwards, that Unity often asks to post here too, in order to find that bug-report if they look at this forum post first.

Unity can then use this project to reproduce the issue and test their fix against. Otherwise, it's unlikely that Unity is going fix this issue on their own if they don't have a bug-report in their system (from my experience).