This is in reply to this post here: as I saw this same behavior.
www.jomsocial.com/forum/profile-universa...or-non-admins#108791

I might wish to make a suggestion here, that when a users "un-associates" their Facebook Account, that the password field then be shown again for that user. Otherwise, its seems confusing from a users perspective that they can't change or update their password in the "account details" section where it would normally be found.

Thanks.

Hi Neal,

Once you connected to FB, you can't use regular password anymore, this is default behavior from jomsocial design.

thank you