External libraries stopped loading

Working fine earlier today, in the last couple of hours any external libraries that are included in the app under the "scripts and styles" tab fail to load.
Error in the console is "Encountered error in loading JS library"
Tried direct links, cdnjs, alternative hosts and different libraries, all have the same response.

Hi, what are the external libraries that you use?

It was Pusher that was the main concern, switched to cndjs and tried other libraries and had the same result. Not changed anything here and this morning it's loading again.