Could you please advide which version of Cummunity builder and which version of the jD community plugin you are using.
Need this info to create a test site
Also could you advise what version of MySQL or MariaDB you are using as we have fixed earlier problem with jD3.9 upgrade. The problem for some users was the version of the database. You can find this info in Joomla! System - System Information tab. Also helpful to know which version of PHPC