I decided to start a survival on my Aternos server with my sister, but after a minute or two of playing, she can't right-click anything and she has to restart Minecraft to fix it, only to have it happen again. We're both using 1.10.2, but I'm using OptiFine...that wouldn't make a difference, would it?
I also know this is serverside, as we usually play a minigame together where you have to right-click chests to get items, and she's never had any problems on there before.
Any ideas?