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Hello, we've had quite an odyssey yesterday trying to get the update(s) work. I had to replay our last backup for 3 times because via ijoomla-installer the installation was from JomSocial 3.2.1.4 only to 4.0.9. It was not possible to update to the last version 4.2.5. It was hanging again via "complete the installation"/database entries. And if I install 4.2.5 via the joomla installer it will break the site (white screen). So I had to replay the whole backup and tried again. I spent the whole day dealing with this update.
Now on the live site is Joomla 3.6.2 running with JomSocial 4.0.9. At this point the JomSocial-backend isn't reachable (white screen) and we can't administrate nor we can update to the last version of JomSocial 4.0.25
BUT... :) I still get the blank page on your backend, this issue caused by this error :
Warning: require_once(/homepages/u57051/joomla_3_3/components/com_community/models/community.php): failed to open stream: No such file or directory in /homepages/u57051/joomla_3_3/components/com_community/libraries/core.php on line 656
Fatal error: require_once(): Failed opening required '/homepages/u57051/joomla_3_3/components/com_community/models/community.php' (include_path='.:/homepages/u57051/joomla_3_3/plugins/system:.:/vrmd/webserver/php-5.6.26/lib/php') in /homepages/u57051/joomla_3_3/components/com_community/libraries/core.php on line 656
For fixing this I need your FTP access so I can fix this directly, and then I will let you know whats going on :)