Hm, strange. Just tried it on linux and get the same behavior. When looking into the dev tools I see the js error: request to http://localhost:8100/0.5/auth failed, reason: connect ECONNREFUSED 127.0.0.1:8100
when clicking on the rocket sign.
It seems that it's still trying to connect to a launcher or something. I've definitely switched to dev branch.
Out of curiosity downloaded @JPL 's compiled version. Same result. It seems it's a problem of my system (both windows and the linux VM). Has anyone experienced this error or has an idea what could be blocking the connection to localhost?