I think they issue you are running into is with the logic that draws a black loading screen over the UI to allow the zombies and everything to load in before revealing the world to the player.
It looks like this is not being updated for some reason after hooking things up in your new project.
Here you will see in the PlayerController where the loading screen is disabled after the player spawns in.
You can disable this logic int he **MPTopDownHUD **by setting the default value to **IsLoading **to **False **to debug and see if that fixes your issue. If you feel you don’t need that feature you can simply remove the logic in the MPTopDownHUD event graph where Event Receive Draw HUD draws a black texture over the screen.