Upfront (and Spirit) corrupted after update, can't even start Upfrot editor

Everything worked before update from 0.2.x or something to 0.4, but now the Upfront editor won't even start, just saying: "Please, hold on for just a little bit more". Also some styling is gone and Scandic characters are displayed wrong, like väsymystä should say "väsymystä".

Luckily I made the update in our staging area so the main site didn't blow up, I will happily give you access to take a look.