Character Won't Move

I have searched far and wide for other people with this issue, but I can only find people with similar issues, whose solutions don't work for me.

So I was playing on a multiplayer server and teleported back home with the magic mirror when suddenly, my character wouldn't move anymore. Here's a list of details and things I've already tried to fix it:

- Rebinding the keys (strangely, the 'R' key is the only key that works. I tried rebinding left movement to the R key and my character...

Character Won't Move