Originally posted by Marquette1993:I found the fix. Go to Library on Steam , right click on Dungeon Defenders , go to properties , general properties , then click launch options. After clicking launch options type -TCP and then hit ok. Then launch Dun. Def. , go custom match and then click host game. It should fix it. DON'T FORGET TO PUT A DASH in front of TCP and make sure TCP is in all CAPS.