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1. The registration link on the JomSocial frontpage for some reason is pointing to /community/registration/activation (index.php?option=com_community&Itemid=191&task=activation&view=register) which takes the user to the Resend Activation Link page
2. For logged in users: The Profile link points to /community/profile/upload-avatar (index.php?option=com_community&Itemid=136&task=uploadAvatar&view=profile) instead of the user's profile link, for example /community/rubenreyes/profile
3. Also for logged users: The Friends link (and the View All link in the friends pages) both point to /community/friends/invite-friends (index.php?option=com_community&Itemid=147&task=invite&view=friends)
I suggest you contact the ACESEF develpoer for this I try using default SEF from Joomla itself, and everything is working fine, so this is not Jomsocial issue. Anyway, personally I dont suggest you to use 3rd party SEF but I recommened you to use default SEF from Joomla itself.