I am having a similar issue, also with 4.12.5. I’m following this tutorial here: UE4 Event Dispatchers - YouTube
But when I try to plug the red wire from my custom event (level blueprint) into the bind event, I get the “Delegate is not compatible with delegate (by ref)” error.
All I want to do is update the number of lives left, which the player pawn is keeping track of. This seems like something that should be easy to do.
-edit Figured it out. Was trying to create a new custom event in my level blueprint, not hunt for the one in the right-click menu, durrr.