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3.2.07 is a stable version and can be installed on Live sites
3.2.1 beta is a beta release and should NOT ever be installed on a live site. We offer no support for beta versions because it is for reporting bugs only.
In regards to loosing data when you uninstall, this should not happen if you uninstall jomsocial using the joomla manager then re install our product
Remember to make sure you have a full site backup before you do changes to your site