Me and my friends have recently made a infection map on forgeworld, we have set the gametype spawning and labels correctly, and the map works perfectly on forge mode. Although as soon as we begin the match in custom games, the screen says we are out of bounds and kills us in 10 seconds although all of the spawn area is within the maps boundarys.
Make sure that you don't spawn either within kill boundaries, or outside of all safe boundaries. That's the number one cause of the problem.
You want to spawn INSIDE the safe boundaries, and OUTSIDE any soft kill volumes. FYI this goes in Reach forge discussion.