I have been looking to use one of my old mission files from back in 2014, version 3.1.3 Altislife. If I take the mission.sqm as is and put it into the 5.0 version it works fine, other than a few npc's that the coding needs updated. But if I put it into the editor, of course it wants to updated it to the newer format. If I do that when I load the mission it comes up error loading mission. I checked the mission file for double entry's like someone posted but no luck. Anything else that I missed to look at?