Sorry for the inconvenience.  Known Navigation header breakage, its being "rebuilt."
There may be other unforeseen breakage primarily in the handbook portion of the wiki.
The Table Of Contents section of each "PC-BSD® Users Handbook" page may be the best workaround.

Categories

Jump to: navigation, search

The following categories contain pages or media. Unused categories are not shown here. Also see wanted categories.

Categories  
(first | last) View (previous 20 | ) (20 | 50 | 100 | 250 | 500)(first | last) View (previous 20 | ) (20 | 50 | 100 | 250 | 500)
Personal tools
Namespaces

Variants
Views
Actions
Navigation
Toolbox