Ive recently ran into a problem trying to use Viveport SDK in a new project with .NET set to 4.6 in Unity version 2017.1.1p4. What happens is that when I start the Viveport Demo in editor everything works as intended and I can quit the game normally. The second time I try to press play in editor the editor crashes. I tested the exact same scenario with .NET set to 3.5, so Im guessing its a .NET issue. Is this issue known and what can I do to reslove it?
I believe this may have been addressed in 2017.2 or 2017.3 - I would say this is a Unity Editor issue (does it happen with standalone builds?) and would check known issues lists with each Unity release.