I just ran into an unusual error, when adding a hyphen into the button secondary text my console pops a JS error and the following happens.
- The preview stops working, any further changes aren’t updated
- Save works successfully, but when I load the live page afterwards it gives a critical error on that page only
- Similarly, if I reload Cornerstone on that page after saving it won’t show the preview either.
I’ll add the screenshot of the JS error in the next comment as it shows my site URL.

