Sorry about that! Would you be able to let us know which browser and device you're using?
We're seeing some errors come in through Sentry about Firebase auth being unable to persist things in local storage, that may be what's going here. We'll keep digging!
Thanks again for the bug report. We've managed to get someone on the team to reproduce the issue, it seems login-by-email doesn't work correctly in Safari for iOS. We found that after you click the email login link, it'll appear you're logged out, but once you refresh the page, you'll be logged in.
We'll work on getting this squared away, but in the mean time, perhaps try the refresh- workaround; or a different browser or OAuth login method.
We're seeing some errors come in through Sentry about Firebase auth being unable to persist things in local storage, that may be what's going here. We'll keep digging!