Log In Immediately Logs Out?

[chadgupny]

I am having an issue with signing in. The prompt accepts my username and password, and briefly shows the main screen, but then redirects me back to log in. My friends said it showed like I was signing in and out and in and out.

I'm on Firefox on Linux - also tried it on Firefox on MacOS. I tired disabling all my extensions (though they've been OK in the past). In dev tools I can see the PlayerID and SessionID are set in the Local and Session storage, and an Angular error message right after the log for going to Inbox:

Uncaught Error: Permission denied to access property "ng339"

I have tried the kick/resign buttons, as well as resetting my password. Always the same. Any help would be appreciated! My username is as here- chadgupny