Hi all.

When I try to edit a block I get an error message and a long block of red text (what appears to be the page, or block code) in the edit area as per the attached image.

Before the error I changed some CSS, and added some code to generate a canonical tag, but as everything else is working fine, and this problem doesn't appear on every machine I can't see this being the cause.

I have since updated, re-connected to the community, cleared the cache, turned the cache off, undone my edits (to the best of my memory), and still no luck!

Any ideas?

Thanks,
Dan