Fix for T-pose glitch?

Recently, I was afflicted by a glitch where anyone I invade or anyone who summons me is stuck in a default pose, and instead of moving their legs to get around they just float. This has the added problem of all other mobs in that players' world being stuck in a default pose also. It makes bosses completely not fun to kill, because for some reason the game does not register anyone actually hitting or doing damage to me since the boss isn't actually doing anything but floating around on my screen. It likely makes it seem like I am just using an invincibility glitch, and it really is like that. Everything is fine in my own world, it is only when I invade or help others that the glitch occurs. Anyone know a fix? Would really appreciate it so I can go back to sunbroing.