Currently on the MastoFE logging out and in will show a scary message about "Corrupted Content Error". This is due to a change that was recently added in upstream Mastodon, and that we merged into MastoFE at just the right time :)

If you encounter that, a workaround is that of disabling service workers for your instance. For Chrome, type chrome://serviceworker-internals/ on the address bar, for Firefox it's about:serviceworkers. Once you're there, unregister the service workers for your instance URLs.

I will try to patch it today and get it into upstream Pleroma, but for now you can work it around this way.