I have reinstalled the game but this hasn't solved the problem. (I connected the game to my FB account so I can restore my progress from the cloud.)
I have made a video about the bug. It isn't the best quality but I hope it helps to fix the problem.
Online angol nyelvtanfolyam tanári felügyelettel, mindössze havi 990 Ft-tól! > http://tinyurl.com/yvpnn99r