I am using plugin "404 Notifier", version 1.2a, and no other plugins related to 404 handling. I am subscribed to the RSS feed generated by the plugin, and it reports URLs which, while not fitting into my permalink structure, still seem to work.
For example, I get:
404 URL: http://www.sagoclubs.co.za/stbopen-2006/
Referring URL:
User Agent: Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)
However, entering http://www.sagoclubs.co.za/stbopen-2006/ in my browser ends up loading the desired page after a redirect to http://www.sagoclubs.co.za/stellenbosch-club/stellenbosch-open/stbopen-2006/.
I would really like to get rid of these non-errors so I can identify links that really are broken on my site - any help would be appreciated.