Sorry for taking so long to get back to you; busy times.
Upon further investigation, it seems maybe our membercount is to blame. If I scroll down to the bottom of the page (as it is still loading) I notice this error at the bottom:
Fatal error: Allowed memory size of 268435456 bytes exhausted (tried to allocate 4194304 bytes) in /var/www/test/org/wp-includes/load.php on line 569
That is to say, your plugin’s way of displaying and managing members isn’t really ideal for a site with 10k+ members, heh. We are exploring different options, but I think it’d be in everyone’s best interest if you redid the listing/adding UI into something paged and search-based.
I’ve enjoyed using your plugin for a good year though, thanks a lot!