Hello!
I just wanted to write this post in case someone has the same issue and is trying to figure out the source of the problem. After an update to my Pro theme, I noticed on my post pages the navigation buttons were not loading anymore in Cornerstone. I saw the red loader in the bottom right corner that just kept spinning, indicating there’s an issue loading something on the page.
Well, I finally figured out the culprit. It was the angle bracket symbols in the button text. I had 2 buttons that read “<< Older Post” and “Newer Post >>”. After removing the angle brackets (<<) from the primary text field, the buttons load properly in the viewer.
This happened because I used the actual symbols, which are HTML entities and are reserved for HTML only. If you use the less than (<) or greater than (>) signs in your text, the browser (and cornerstone) might mix them with tags which would break the site/builder. I’m not an expert in correct coding syntax and I didn’t know, but now I do! Hope this helps!
The correct way to display angle brackets is to type < or > instead.
Thanks!