Content can’t be loaded error – Only for specific user

Hi!

A customer of mine has an error that I can’t seem to replicate for myself, and therefore is having a problem fixing. Maybe you could help me figure it out.

The person is getting a “The content can’t be loaded, since it’s not allowed on the site” error. The error shows up on every page of the website.

Apparently the problem persists even after clearing the cache and also while visiting the website via a “private” window. However, the person only get this error in Safari and not in Chrome.

I don’t get any indication in the console that there are any scripts etc. that is not added in the “Domains” section of the plugin settings.

Any idea what the problem might be?

Thanks in advance!
//Dan

The page I need help with: [log in to see the link]