Howdathoppen?
While at the main forum page
http://www.mersenneforum.org/index.php I was surprised to see GPU Computing listed on a separate line of its own under the Hardware line, not as it usually is as a subforum under Hardware. However, it did have an extra box shape at the left side of its line, so I presume that was simply another format for displaying subforums.
After I clicked on Hardware, then back to the main page, the display was back to its usual format.