After opening a LAN and attempting to quit the game it will just freeze, I cannot use the red x to close out and I must force quit. I would say this happens about 80% of the time. It does not automatically generate a crash report. I am using an ummoded client, no optifine, no shaders, nothing. Im sure this is not enough information to help you guys understand what exactly the problem is please let me know what additional information I can give you to help fix this issue