We are using 4.15. We recently had to begin using a custom player start due to a bug between our single player tutorials (infinite death on spawn) and our multiplayer pvp game. The problem is, during the server travel to the selected map and mode, it works fine on all but 2 maps. It is only these maps specifically. We ended up having to remove them from the build entirely for our last milestone. I have copied our blueprints for both the gameplay and lobby game modes and player controllers to blueprintvue.com.
You can run the selected map in standalone just fine. However, if you try to run one of these two maps in standalone from the main menu (Lobby) it is stuck in an infinite loading screen. When looking at the logs, it can seem to spawn the FPC and is always trying to spawn it at the world 0, instead of the spawn point.
136169-
[Lobby Player Controller][2]
[Lobby Game Mode][3]
[GamePlay Player Controller][4]
[GamePlay Game Mode][5]
[Game Log][6]
Player Spawn Points
136166-136167-
/blueprint/s0657wu3/