If you are receiving an alert from WordFence, saying something like "A potentially unsafe operation has been detected in your request to this site", here is how to fix it:
Solution: Put the WordFence firewall into learning mode. Then take this same action (that originally caused this block) and it should be whitelisted going forward (at which point in time you can turn off learning mode).
For more information on Wordfence's Learning Mode, see this page of the Wordfence website.