@dredmorbius Hello: strange, seems to work on my side. No maintenance, we're on 1.4.7 stable.
Have you tried connecting with another browser altogether? If it works there, perhaps an issue with the cookies: try erasing any cookie from mammouth.cafe (and if available any open session) and reconnecting after that.
I'll have a look at the issue tracker over on github, maybe somebody else has had the same problem.