This may be a coincidence, but shortly after seeing this(https://github.com/blog/2378-nested-teams-add-depth-to-your-team-structure) announced by Github, I suddenly am seeing “You don’t have write permissions to the repo”, when I do (I checked in Github). I triggered a resync with Github and our team suddenly is missing nearly everyone.
Support handle this. Its a weird issue with Google Chrome beta build 60.