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.
Category:Pages with broken file links
Flat html is a special aggregate page. The rest of the listed pages contain either [[Image:blah.jpg]] instead of [[File:blah.jpg]] or have the wiki markup to include a file but the file does not exist. The absent file is shown by the red text for the broken link, the other is only determined by examination of the wiki markup itself. The contents of this page may be taken from cache and therefore changes may not be reflected immediately.
Pages in category ‘Pages with broken file links’
The following 16 pages are in this category, out of 16 total.