Ok, to go around your misconfigured host, a new CBSubs nightly build is released (you need to upgrade at least the Family Plans plugin).
To upgrade CB plugins to the latest versions is easy:
For CB plugins, login first to
www.joomlapolis.com if not logged in.
Then with same browser go to your site to Extensions / Community Builder / Plugins, then click Install plugin button, and go to "Install from Web" tab.
There you will see any upgrades that are available free for you. If not, just click the small refresh icon at bottom right to get the page updated and the plugins visible.
During upgrade process, please make sure that you have no installation in the Failed column.
Tracker item:
forge.joomlapolis.com/issues/8035