Sorry, forgot to add. The 404s ARE being logged, I just checked the database table, wp_redirection_404 and see that it is populated with many entries.
However, for some reason, the display of these log items won’t display in my browser when I click on the “404s” link. Tried different browsers, no joy in any of them. The “Support” link shows all things green and “Good.” Using database version 4.1.
Do you have any filters applied on the 404 page? For example, do you have something in the search box, or are grouping by URL.
Are you using any caching system?
I figured this out and will leave this here in case someone has a similar issue. I saw that you’re calling this via a URL with “404” in its link, which led me to investigate whether I might be rewriting numbers in my .htaccess file for redirection. And lo and behold, I was, as we had changed the permalink structure on this installation to remove some date stuff. When I commented out these rewrite rules, the plugin worked as designed.
I suspect our rules just need tweaking or we need to add a conditional to them. Thanks for the response; much appreciated!