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Minor issue not for sure that it is JomSocial related...
Pre Upgrade - Cloned website just for testing then installed upgrade/updates (php7.1; Joomla 3.8.1, JomSocial 4.3.3)
Everything works great on the clone site....
Actual Live site every time I switch the PHP Version to 7.1 from 7.0 (Joomla 3.8.1- JomSocial 4.3.3), if I switch it back to Php 7.0 it works great.
When a user hits the JomSocial Page following error shows:attached