Some bug that prevents you from levelling at around level 50. Can be kind of random, tends to come when you don't want to and erases all your progress towards the next level when you can suddenly gain experience again. Figured out how to fix it, works with two people now. Hopefully it works for you When you see this and the game loads up, simply provide no input. Reliably every time input was provided, like hitting enter or typing a message when I was loading in like /players would immediately prevent me from gaining any source of experience. If you simply take your hand off the keyboard, let yourself load in until you see your character. Provided you didn't hit enter or type anything you should be able to gain experience now.