Okay, I hacked through the API changes and reimplemented all my 1.6 tricks in 2.1. It’s much more sensible now.
__ALLNODES__ problem happens only as long as I have any old 1.6 assets in the scene and library. Simply removing them and manually upgrading works fine. Clicking in all the graphs again is a pain, but it’s bearable.
Now the biggest issue for us is 2.1 not working on Xbox One which was fine in 1.6 (it’s the same issue AOT compilation problem that causes problems on iOS, we presume). I would love to get all updates on progress of that!