I had the same problem, the autocomplete plugin that comes with this plugin shares the same namespace as the jQuery UI plugin. I changed the function name in the included autocomplete.min.js plugin to “BPautocomplete” and changed the useage of it on line 19 of group-invites-js.js to match:
a = j('#send-invite-form #send-to-input').BPautocomplete(options);
I know you shouldn’t hack a plugin since it will cause issues during upgrading but it’s silly to name something so generic that it will most likely bump into other functions.