Sorry for the inconvenience. Known Navigation header breakage, its being "rebuilt," forward and back nav should function where present.
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.
To install a PBI, start AppCafe® by double-clicking its icon on the Desktop, going to [[Control Panel/9.2/9.2|Translations:Control Panel/9.2/Page display title/9.2]] → [[AppCafe®/9.2/9.2|Translations:AppCafe®/9.2/Page display title/9.2]], or by typing appcafe from a command prompt. The "Browse for Apps" tab in AppCafe® can be used to browse for available software, as seen in Figure 7.1a. In the example shown in Figure 7.1a, 1153 PBIs are currently available. The names and versions of the PBIs which were added or updated in the last 10 days are listed in the “View Recent Additions” pane.