player issues

i made stairs and as i go up them my charcter will bonce off the step of the stairs and fly through the wall out side the building. not a big issue but just telling you and can you fix the issue with zombies walking throw you as you attack them. its kind of annoying. is there a way to make things like walls see thought when your camera is on it, it is hard to build inside buildings when you cant see throw walls. other then that so far so good.

thanks

read the update progress... >.>