My apologies for putting this in the Airgun Section but it's one that accessable!

If I try to navigate to Non Airgun I get this message:

Not Found

The requested URL /forum/general/non-airgun-related was not found on this server.

Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.
The same applies to the Firearm Section.

However if I start from the list of Sections I can get onto the current thread by clicking on "Last Post" This will only take me to that post and will not allow me to navigate from there to Non Airgun".

Other Sections are available from the main menu, it's just Non Airgun and Firearms that are not accessable.

Any ideas why?