So I have a bit strange problem. Unity driftland disappeared from track list on game. It was there last night and working fine but not today. I didn't change or install more maps. Tried to verify files but didn't work. Deleted the map and installed it again. It is in the right folder. Funny thing is that it shows up on Content Manager and is working from there, so yes I can still play it but I'd like to know why this happened.