I was able to open the project you sent me, launch it and play it just fine (both in live UEFN and on an internal build)
So whatever you’re seeing is specific to the project on Creator Portal (which I don’t have access to obviously) or specific to your local settings/user account (less likely) but it’s not caused by the project source files themselves
To investigate further I would need a complete UEFN log with the following steps:
- Start UEFN
- Open the project
- Launch Session
- Wait a bit to make sure it’s really “stuck”
You’ll typically find the log file here (check the timestamp to make sure you get the right one):
C:\Users\<USERNAME>\AppData\Local\UnrealEditorFortnite\Saved\Logs\UnrealEditorFortnite.log