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ijoomla shows a blank page after clicking upgrade.
The url also states ....administrator/index.
I have also noticed that some of the module urls for Jomsocial both public and profile go to the wrong urls after the last upgrade which was done with ijoomla installer.
If the iJoomla installer is not working on your site, you can install the Jomsocial package directly with Jomsocial package ( com_community_pro_3.2.1.zip), which you can download one all bundles from "my account" page
www.jomsocial.com/component/digistore/licenses