So it is not connected to my account, but with the servers: http://forums.cardhunter.com/threads/bug-failed-to-load-game-data.7882/
In the morning (about four hours ago), I already had this issue, but just one time. Then when the league started, I had this error several times, but finally was able to login. At the moment I am not able to login, since I get this message every time.
It is strange only we both complain here. If there it is a server issue, they first have to track it down. May be a restart is enough, may be not.
Guys, i'm re_installing windows, will let you know the results , when im done in about 5 hours (joke, i have the sameproblem, almost thought all my items are gone)
Tried it another time. This time I was able to get to the multiplayer screen, but did not see the league status. When clicking on the Purchase chests, I got a spinning wheel. Since I was able to see the player list and the current ongoing games, there are just some people, which have this problem. Do you use also the webclient?