The site I created and have been working on with no issues suddenly doesn't want to let me add pages or add content.

When I try to add a page to the /Home/ page, the add page popup shows "Page not found" (see attached file).

Likewise, if I try to add a block/content area to a page, the popup appears with nothing more than the spinning wheel (the add content block never appears) or I get the same "Page Not Found" error.


Can anyone help... or at least point me in the right direction where to look? I'm not sure why this has suddenly started occurring, but it's obviously stopped me cold from doing anything!

Thanks,
David