I’m fairly new to wordpress code but I had almost the same problem with this plugin with page redirection. I used it, it didn’t work, then I uninstalled it, but my page url didn’t function anymore either.
Finally I opened PhpMyadmin and found in my database “wp_9redirection_items” and sorted that by “last_access” and deleted everything related to that specific url – and after that, everything started working again. Thought I’d write this down here if anyone else encounters the same problem 🙂
