Proxy server changed - thanks Ben!
Until a couple of days ago we were running DevRoadmaps behind Apache. I had problems getting some URLs to map to their correct location (like www.devroadmaps.com/clarion and www.devroadmaps.com/windev) and Benjamin Krajmalnik recommended I try Nginx, a proxy server used by many sites including some giants like GitHub and WordPress.
As always, his recommendation was right on the money and the above links are now working. Thanks Benjamin!