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With new updates for Jomsocial 4.0.6 I noticed that the information "Member since" and "Last online" in "About me" disappeared.. But it is a relevant information that can't disappear in the profiles.
please follow this steps:
1. copy profile.about.php from /components/com_community/templates/jomsocial/layouts/ to /templates/[frontend tempalte]/html/com_community/layouts/
2. edit it, and put this new code after line 107