I had the same problem this morning on my tablet. It was impossible to switch to other servers. Emptying cache didn't help, but removing all data did the trick.
I can play on NL and International servers again. Not on beta though!
No idea if it's possible to implement, but some sort of perk making it possible to exchange (inside fs) artifacts for leveling up event buildings.
Having all the event buildings in the inventory is not really productive if you can't level them op to 10th stadium. By the time you have gathered a...