Hey guys, something went critical as you have guessed. In theory all is now resolved. However if anyone is still having an issue please raise a ticket direct with support: www.innogames.com/support
@ Lelanya: I have been reporting the problem to support since yesterday. They told to switch the tablet on and off (which I have done together with reinstalling and clearing the cache BEFORE I contacted them). And then support told me that there is a problem.