on the scene tab there is the custom reset button, you can launch the game and spam it a few times, might take a few restarts to try thats how you fix it, other wise I think the only other thing I've heard is you need to look up where your macromedia flash .stol files are and delete them all. Previously the best way to do that was to delete all your web browser data but I don't know how that works now a days but the folder is somewhere in appdata I remember