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.
Translations:What's New Since 9.1/26/en
- The system has changed from the traditional ports system to pkgng and all of the PC-BSD® utilities that deal with installing or updating software now use pkgng. This means that you can now safely install non-PBI software from the command line and that a system upgrade will no longer delete non-PBI software.