Thanks for the tip, @rtatsi. I tinkered around eventually discovered it was in conflict with a script in my theme. I’ll check out the plugin for future use.
Having this same problem. Wordfence has successfully locked me out of its plugin. Congratulations guys! And I see this is an issue that has been going on for a long time. (Two years?) I’ve tried a number of work arounds suggested on other boards. None have worked. GET SOMEBODY TO FIX THIS. THIS IS CRAZY.