Hello Guys,
I also had the problem with the camera panning to the ceiling. The player model reset did fix this for me. It also fixed this annoying problem of having to jump though the doorway to get into my shop.
To open the Jar file, you need to have the Java Runtime environment installed. You can get it here, but you might want to search it to make sure you get the most updated one. The best place to download it from is Oracle, as they're the ones who make Java.
Big thanks to whoever made that tool to reset the character!