I've just updated the game to version 0.5.1.5.

The good news for all Mac and Linux users - the game should not crash any more when saving/loading a game. There was a problem with an external library and I had to write the code by my own. That´s why the update took a bit longer than it should have taken - sorry for the delay.
Here are the other patch notes:
- NEW: ESC key tabs into the game again
- FIX: Saving/Loading problem on Linux/Mac solved
- FIX: Bus lines can not be deleted correctly (no crash any more)
- FIX: Tutorial can now be continued with trackpad only
- FIX: "Delete" button in loading screen will now be translated
- FIX: Football ground showed productivity accidentally
- UPDATE: Translations updated
- UPDATE: New library for saving/loading added (removed old library)
- UPDATE: Increase the zooming value a bit for better visibility
Just keep reporting when there are any issues. I'll keep track of them.
Enjoy playing!
Cheers,
Christian
Changed files in this update