Hi Paul,
I've got a problem with AC20 projects opened in AC21 and running the 3.7.0.76 (64 bit) plugin.
It stucks while "Loading Materials from Scene. Please wait..." (even small scenes / after ~30min no progress)
After reinstalling 3.6.4.74: same problem.
Ditn't work for a while with AC21, so I can't tell since when it doesn't work (anymore).
By the way: AC20 and 3.7.0.76 - no problems, and: new project started in AC21, no problems, too.
Any idea?
Greetings,
Artur