You must have a fenki character then. Yeah, they can\'t sit yet. Even with the menki character, they will stand up and down over and over again to others. Its a known glitch. As for the error on exit, well, I get that a few times as well. Doesn\'t happen all the time and it doesn\'t seem to effect the game as it loads up just fine again. Sorry, can\'t tell yeah much about that.
edit: typos