Update (15:50): I have now received a reply from CloudFlare to say that the problem has been rectified. I no longer get the Challenge page when I log-in or try to post a comment, but if anyone continues to do so please scroll down to the bottom of the Challenge page, make a note of the Ray ID and the IP address then email them to me at the usual admin address ( admin{at}fifteensquared{dot}net ).
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To reduce server load via caching and lowering the number of spambots etc, you are connected to this site via CloudFlare. If an IP address is on CloudFlare’s blacklist, or if the browser information indicates the possibility of malware, then a CAPTCHA is presented so that it can be proved that access to the site is being requested by a human.
It seems that something has gone wrong today and people are being presented with the challenge page unnecessarily. I have taken what steps I can to rectify this but with no success. I have therefore raised the matter with the CloudFlare support team and am awaiting a response.
Until this issue is resolved, please accept my apologies for any inconvenience.