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:Burning the Installation Media/9.2/58/en

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bunzip2 -k PCBSD9.2-RELEASE-x64-USBFULL.img.bz2

dd if=PCBSD9.2-RELEASE-x64-USBFULL.img of=/dev/da0 bs=64k conv=sync 63200+0 records in 63200+0 records out

4141875200 bytes transferred in 1395.261087 secs (2968531 bytes/sec)
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