Hello, this is also my first post. Anyways, when you go to options > keymap and assign a key to walk, it won't work and your character will freeze and won't move (as long as you keep holding the walk button you assigned). Basically, you cannot walk on ground.
The solution is to log out on ground and log back in. And your walk button will function properly. However, I believe it will stop working again once you go to space again.