I believe the fix is in vbulletin-chrome.css (according to mustangguy1230) to have the sub-link bar show up on the homepage.
When I chrome inspect element the sub-link bar at:
http://broncosforums.com/ it shows how they fixed it. I don't know how to interpret that to find the placement of the fix.
I'm using vBulletin? Version 4.2.1 and vBadvanced CMPS v4.2.1 just like many forums that are also missing the sub-link bar on the homepage.
Once again, thanks in advance.