Well, we could never get
plrmoveup to work. Now that I think about it, you may want to try
playermoveup. I say this because TGC put some commands in the manual - like
plrdrop - that were spelled differently in the engine. We always thought
plrdrop was one of those commands that they just never implemented, when in reality it's supposed to be
playerdrop, and it does work. So try
playermoveup and see if it's the same situation.
If that fails, you will have to associate the player with an entity (the old way) and move the entity instead of the player. That works well for vertical, but not for horizontal movement.
Let me know how you get on please.
Best.
I'm sorry, my answers are limited. You must ask the right question.