Create a new blueprint that inherits from the ShooterGameMode c++ class & save it. (You don’t need to modify it)
In any other blueprint try getting all actors of class of that new blueprint and then casting to it (I don’t believe it matters where you do the cast as long as its a reachable node)
Compile & Save
Attempt to reopen the editor (The editor will now get stuck at 71%)
I can send the modified shooter sample but since its 1.5gigs and the steps are very simple I don’t really see the point.
BUMP!
I have spent 2 days fighting with my GameMode class. Same symptoms, editor stuck at 71% as soon as you have BP Game Mode inherited from c++ class.