Same exact problem. Everything is up to date. The latest update to Yoast Broke it!
Indeed. Here the errors in the brower console:

After the update I am having issues with Yoast and Next Gen conflicting.
As soon as I activate Yoast, NextGen stops working. Deactivate Yoast – Success!
I love these two plugins, so it is a problem that they do not work together.
Any thoughts on this?
Simon
I have the same issues after WP was updated to 4.7.4
I fixed my problem for now. I installed WP Rollback Plugin (which was untested with my Hueman Pro Theme-but what the heck. Somebody had to test it).
It worked . I rolled back to last version prior to the current one and I got my panel back!. I will not update Yoast again for at least a month.
Sometimes strange behavior may be caused by a plugin or theme conflict. The fastest way to rule out conflicts is to deactivate all non-Yoast plugins and switch to a standard theme like Twenty Seventeen. If this resolves the issue, you have a conflict and should activate one plugin at a time until you locate the conflict. Finally, after all plugins are active, switch to your theme. This will narrow down the conflict to a specific plugin or theme.
If you are unfamiliar with checking for conflicts, we wrote a small guide that will walk you through the steps. You can find it here: How To Check For Plugin Conflicts
I will try but with the version 4.6 was all perfect.
As administrator works, other roles as editor does not work
I tried and it works until version 2.3.5
The superior versions not works anymore.
I noted that the versions not working call the jQuery UI.
It’s possible a conflict?
after the update of 4.6 and move on can cause more CPU Load on server
4.5 version works well
The plugin works again. There was 2 jQuery versions loaded.
Now is loaded only jQuery 1.12.4
So, it was a jQuery Conflict.
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This reply was modified 9 years, 1 month ago by
gaetano89.