This happens to me as well. Most noticeably in a customised world when playing multiplayer on the local network. I've let the game screen sit over night before, and it made no difference – the game was still hung and the only way to quit was to use the task manager to kill the process.
I'm also on WIndows 8.1 (64-bit), but I'm using Java build 1.8.0_20-b26 (64-bit).
Dev Null
This happens to me as well. Most noticeably in a customised world when playing multiplayer on the local network. I've let the game screen sit over night before, and it made no difference – the game was still hung and the only way to quit was to use the task manager to kill the process.
I'm also on WIndows 8.1 (64-bit), but I'm using Java build 1.8.0_20-b26 (64-bit).