It may not be compatible with current version of Jomsocial. Jomsocial constantly updates and updates were breaking the template. We had to recreate from scratch and thus this past fall decedied to discontinue support on it:
http://www.shape5.com/component/option,com_smf/Itemid,75/topic,19013.0/You could check with Jomsocial and see whats going on, if they have an idea why its not saving your template selection in the admin