The Wachamacallit on "[Plugin: Custom Sidebars] Admin Privileges"

Ok, I see it...

Had to figure out the direct link to that screenshot since it was to small to view:
Bigger

(You might want to use https://screencloud.net/ next time, it's free!)

Looks like you are using a Mac OS, I'm not so sure what the problem might be.

What I would do is make sure I got that latest updates on everything: Operating System, Chrome Browser, Word Press, and Plugins including Custom Sidebars, I might even try RE-Installing the plugin.

If you are already up to date with all your software, Nastia and Predrag would be the best to handle that issue, perhaps another one of your plugins has a java script conflict.

Usually, by deactivating the plugins one by one, you can find out which one is causing the conflict.

Hope that helps!
Kudos to you, I also live in AZ and are getting involved into RE.