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the issue not with jomsocial. but you put wrong link/url on it.
for example:
at Ayuda page there is a link with name:
"como activar mi codigo numerico"
the issue not related with jomsocial. any URL handler always do it by joomla it self. because jomsocial running under joomla.
seem the issue related with joomla htaccess file. please open new topic at this forum:
forum.joomla.org/