Anyone having this issue? After I updated the game, my progress disappeared and it wouldn't be so strange if it happened only then. But while I was playing from the beginning after the while it happened again.
I think i might have found solution - just delete the game and install it once again.
It seems to be working fine after reinstall, but I've only played couple of days since, so I might be wrong.
When I launched after update I was terrified because I thought that all my progress dissappeared. But I quit after first lvl and fortunatelly everything was OK. Maybe try to reset your phone or something like that ?