Yet another development. I found this thread: .uproject file's EngineAssociation saves a GUID, which causes problems for teams using UE4 source code - Character & Animation - Unreal Engine Forums. It claims the ue4.uprojectdirs file solves this issue. I had already set that up, but it didn’t appear to help.
Are you supposed to be able to double click on the .uproject file if you have this setup? That part did not work for us.
Seems like this really needs a Documentation page. It’s difficult piecing this all together from many AnswerHub posts.
EPIC, help, please!