I also confirm that this problem exists.
Vasilios Panousis
Greetings to everyone. First of all, I believe enfold is probably the best theme for WordPress.
I had the same problem to upgrade from version 4.4.1 to 4.5 which was published recently.
However, when I changed to paren enfold theme from the child one I was using and tried to update again the problem was disappeared. Afterward, I changed to my child theme again and proceeded to import the settings from the parent.
This way everything is working just fine.
Best regards
Enfold customer