Admin Dashboard Javascript Not Working on Some Pages

Two days ago I noticed that I am having a Javascript issue on my admin dashboard. The last time I’m sure it was working properly would be 4 days ago, November 12, 2017. I Updated to WordPress 4.9 yesterday, which had no effect.

It seems to have come out of the blue. I first noticed it when trying to open the “Screen options” while trying to edit a post. I am using “Make Plus” – a theme builder theme, which allows me to drag and drop content areas on posts and pages and then fill them with various content.

However, when I went to edit the post, I noticed that the section that was supposed to display the current post content was missing. I figured I’d check the “Screen Options” and sure enough, the “Screen Options” tab would not open. So I checked the javascript on each page of my dashboard and found that it is working properly on every page except the page that displays a list of all of my posts, the page that displays a list of all of my pages, the widgets page, and the editor page for individual posts and pages. Also, when using the menu to navigate around my dashboard, the submenus do not pop up automatically when I hover over them, I now have to click to bring up the submenus.

I did a bunch of research into the issue; I tried disabling my plugins, I tried switching to a different theme, and then I followed the directions on this page to diagnose the issue: https://codex.ww.wp.xz.cn/Using_Your_Browser_to_Diagnose_JavaScript_Errors

I use Chrome regularly, but I double checked my dashboard in both Firefox and Safari and was experiencing the same issue on both browsers. I enabled script_debug and saw no change in the issue. I then disabled script_debug. Finally, I used the javascript console in Chrome. I went to the page with a list of all of my posts and ran it.
Here’s a screenshot of the result: https://i.imgur.com/szWSl5l.jpg

I believe all the unique information is in that screenshot. It does continue reporting errors, but they appear to be identical to the errors in the screenshot.

Any help or direction you could provide would be greatly appreciated! My site is essentially useless at this point, as I am unable to update it.

Thanks!
-Ayla