They are NOT officially supported by the XBMC Team.
If they do not work , 99.9% of the time XBMC is NOT at fault.
(There has NOT been a case where XBMC is the bad guy yet!)
You have either not installed the script correctly, you do not have all the python libs/files, or you do not have a connection to the internet or the script is outdated due to changes on the site it gets its stuff from.
Also remeber to edit your dialogsubmenu.xml in your XBMC/skin/Project Mayhem III/PAL and PAL16x9 folder.
Read the xbmc.log for more information of what may have gone wrong!
Edited by JayDee, 17 September 2006 - 03:42 PM.