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.
PC-BSD 9.0 Handbook
What's New in 9.0
Starting the PC-BSD Installation
Language Selection Screen
Keyboard Selection Screen
System Selection Screen
Disk Selection Screen
Users Creation Screen
Desktop Selection Screen
- Fluxbox is not an option but still available from Session Manager after the installation
- Desktops not seen in this screen may be available as a PBI which can be installed using Software Manager after the installation
- If your favourite desktop is not available yet, submit a PBI request