Sorry for the inconvenience.  Known Navigation header breakage, its being "rebuilt" but forward nav should be ok now.
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:Installing Applications and Keeping Up/9.2/6/en

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Translations:Handbook translating/common/12/9.2 users are highly discouraged from using FreeBSD packages or ports or upgrade tools such as portupgrade or portversion from the PC-BSD® command line as Update Manager will remove your manually installed applications and upgrades. If you wish to practice using these tools, instead use Warden® to create a ports jail. If you think an application belongs in the base system (e.g. an add-on to a desktop meta-package), suggest that it be added using one of the resources in the Finding Help section.
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