En el foro de Jomsocial me respondieron esto:
Withe every new major version of JomSocial there are new features that need to be visually presented.
The one and only way to actually show them is to change template files so that new feature can be supported.
You can still use the old template though, but then youu will have latest version of Jomsocial with crippled functionality.
Pero no entiendo nada…