Hello–
I’m working on a fresh install of WordPress 4.5.3, and just added the theme and required/recommended plugins. I tried to go to the customizer panel and I’m getting an error from navigation-icons.php, line 93: The index ‘slug’ is not defined. I noticed that there is no ‘isset($nav[‘slug’]) check, so I wondering if adding that check would help. It did not..different error appears ‘trying to get an property of a non-object’. I removed my little isset test, and am writing to you to see what you suggest.
As a side note, the Cleverness To Do plugin does not yet work in 4.5, due to the fact that it is using the deprecated getcurrentuserinfo() function.
Thanks
Chris