Hi everyone - I think this should now be fixed for good (as of a few minutes ago), so please keep reporting it if you see it! The issue had to do with localStorage, which is why resetting Firefox/clearing Chrome/etc fixed it for people. But as of a few minutes ago you should no longer have to even do that. Thanks again for all the help debugging! cc @moredakka @gretchen and especially @josefb122 who provided a key clue.