It’s hard! I reformatted once again, installing only UE 4.12 and mac OS :
Copy from 4.10 to 4.12 didn’t work
Blank project didn’t work
Copy from Windows version (where it did a working 4.12) didn’t work.
I am running out of ideas. I join you the log files from the “blank project” version, and from the “windows 4.12 to mac os” version.