Ariuss

I was playing on a lan server I was hosting with my two brothers when after a while and out of nowhere my keyboard and mouse will stop functioning completely in the game until I force quit the game and restart at witch point everything will be fine... It is not some form of lag because it did not clear up and my brothers are both able to play normally (while I cant control my character because the mouse and keyboard are not doing anything) with no lag what so ever. I have only gotten this on Lan and only with this pack. Any Idea as to why this happens?