AT launcher keeps crashing

[WonkierTea]

I have been using ATLauncher for a month or two now and it has worked perfectly. But started yesterday I tried joining instances, everything seemed fine until I tried to join one of my worlds, it looked fine and said "Reading world data" but once that finished it got stuck on the blank screen of dirt blocks. I waited around 5 minutes before I decided to try and click out, but the moment I clicked the screen a box came up that said "OpenJDK Platform binary is not responding". Does anybody know what I could do to fix this?, I'm not good with computers so it's always confusing when I have to fix something like this, but anything helps, if not I already backed up my worlds and hopefully I can find another place where I can import them into and continue playing.