We’ve pushed a new release with two new environment variables it would be great if you can try. We think this was what caused the issue, but still have been unable to actually make it happen on any of our machines. So 
import os
os.environ["RAGDOLL_SINGLE_THREADED_QT"] = "Yes"
os.environ["RAGDOLL_SINGLE_THREADED_INTERNET"] = "Yes"
And then load the plug-in. More details here.