Invisibility Glitch Round 2

I've posted this once and I haven't heard back but still having the same issue. I'm having an invisibility Glitch with my 2nd playing on local split screen. They are not using invisibility potions! They will literally load in invisible and we can't get anything to fix it. We've changed the skin, restarted the game, and had them log in and out. It's frustrating because we play survival and I accidentally kill them. Hostile mobs still see them like it's normal but it's not. They wear armor too and that doesn't even show up. Please fix this because it bums me out whenever we play