Can’t apply any settings and not seeing any errors

Hi, nice plugin, really appreciate it.
I have integrated this plugin on several sites and on a recent site I am working on the plugin enables fine, but changing any settings such as

Pasting the script.
Enabling advanced settings
Enable chat window everywhere

Any option I enable and then press save, doesn’t save the settings, and the page that refreshes after the save doesn’t load completely.

There are no errors thrown in the debug log or anything. I am really at a loss.
I have even tried disabling all other plugins and the exact behavior continues.
Halp!