Unity 2017.1.0f1 - Fatal Error

I’m getting a variety of errors messages any time I select a tree object - SpeedTree, or otherwise - in the Hierarchy (Unity 2017.1.0f1).

97134-fatal.png

97135-fatal2.png

Then please follow the guidelines for beta testers by reporting bugs on the correct forum: https://forum.unity3d.com/threads/welcome-to-the-2017-1-beta-forum-forum-guidelines-inside.463349/