I couldn't find a bug report forum, so I'm putting it here.
On windowed mode if you minimize your game then come back to it your character gets up and starts walking around. It doesn't seem to happen every time but more times than not. The only way to fix this is to point your camera up at the sky before minimizing. I've spoken to a few people using full screen mode and apparently it doesn't happen to them but I can't play in full screen mode, it's a little laggy when I do and I am usually speaking to people on other chatting things.
Cheers. ^.^