I had to publish an update with some hotfixes: 

• NEW YEAR Splash Screen
  Fixed an error when starting the game, preventing you from unlocking the "Happy New Year" Gallery item
• Wrestling Gallery Item Fix
  The Gallery item unlockable in the Wrestling Tournament should now work 
• German Elevator Admin biography Crash
  Fixed an error when talking to the administrator at the elevator screen, causing the game to crash.
• "Ground loudly" double
  Fixed an issue where the same line has been presented twice at the encounter with Nathan after the wrestling tournament
• Unaligned images at the headmaster's home
  Fixed an issue where the images did not match the text at the encounter with the headmaster and Ron in the latest update

A special thanks to everyone mentioning the issues and helping me to find the issues and correcet them!