BuddyPress.org

I decided to go ahead and try replacing all references to is_site_admin with is_super_admin, but it did not resolve this issue.

If anybody else is experiencing this issue, we can continue to discuss in the new thread that I set up for it at https://buddypress.org/community/groups/how-to-and-troubleshooting/forum/topic/blank-white-screen-when-a-newly-created-user-clicks-the-login-link-if-somebody-is-already-logged-into-the-admin-back-end/

Thanks,
Adam