If you are using Fire Fox it is a cookie issue. If Fire Fox you have denied a secondary cookie some time in the past that allows access to that section. I have had the same problem in the past.
If this is the case go to Tools, options. privacy, exceptions and look for any Air Forum cookies that is Blocked. Remove the Blocks one by one till you find the one giving you the problem.
If you are using another browser, internet explorer, it may be the same problem. Internet Explorer has tried to copy Fire Fox to become a usefull browser and they may have set the same conditions.
WBCCI 12156 AIR 3144 WACHUNG TAC NJ6
2004 Excursion 4x4
1991 34 ft. Excella +220,000 miles, new laminated flooring, new upholstery, new 3200 lbs axles