"Shutting Down Internal Server..." message upon loading world.

[PawLurk]

I started receiving this message when trying to load any world. The game would then close itself.

I found that this started happening after I tried to change the Sneak Key from the default to my Mouse Button 5.

Changing it back from the Main Menu solved this problem (though, I'm stuck using the default Sneak Key)

Hope this helps if anyone else encounters the problem.

[TheMrPantsTaco]

Yes! This happened to me last night, thanks!