It's possible your save file might've gotten corrupted. Go into your Appdata\Local\AtC_BB\Saved\SaveGames folder and delete the .sav file. After relaunching the game, it should create a fresh save file and hopefully fix the issue. You will unfortunately lose your progress if you had any, so if you want to back up your save file first before deleting in case this fix doesn't work, you can do so. But the game should function properly now after deleting your save manually and starting a newgame.