OldCP has a bug that renders one unable to move their character. This is most common when jousts happen.
It also happens at random.

Solution: click your player card or simply rejoin and you’ll be able to move again

Yeah, what Zen said usually works but I've hosted jousts before where everyone couldn't move and on /jouststatus nobody was showing. If this ever happens, the joust has to end.

Good Post

This is definitely one of the biggest bugs that need to be fixed along with the no clothes on rejoin thing, I'll forward to Damen when he gets back if he hasn't already seen this.