We’ve released JupyterHub 2.0.2. This fixes some issues in initial user role assignment from 2.0.0, and a regression in 2.0.1 where some proxied requests could be blocked incorrectly during cross-site checks.
jupyterhub 2.0.2 is up on PyPI, and should propagate to other channels such as conda-forge shortly.
Thanks everyone for testing and reporting issues with 2.0!