Hi!
Thanks for contacting us — though I’m sorry to hear you’ve hit up against some difficulties.
I’m not sure that this is the result of our most recent update, however. Have you recently added any security plugins – or changed settings such as to serve the admin environment over HTTPS while the frontend still defaults to HTTP – or anything else along those lines?
When you click on the next or previous month links, we send a request by ajax (in essence, that means we don’t instantly reload the entire page) to fetch whichever month you are interested in. In this case, your configuration means it is using an HTTPS URL for this purpose even though the site itself is served via HTTP. That’s problematic, unless you add support for cross origin requests.
Essentially the same problem can be seen with some of the fonts you (or your theme) are trying to use:
Access to Font at ‘https://your.site/fonts/Elusive-Icons.woff’ from origin ‘http://your.site’ has been blocked by CORS policy: No ‘Access-Control-Allow-Origin’ header is present on the requested resource. Origin ‘http://your.site’ is therefore not allowed access.
Does that help at all? If you’re wholly unfamiliar with some of the terms I’m talking about it may be worth seeking assistance from your web host and/or switching to HTTPS everywhere – frontend and back.