you could try the function:
is_site_admin()
It’s used extensively throughout the BuddyPress core files
interestingly, it has been deprecated in WP3.0 and replaced with is_super_admin:
https://codex.wordpress.org/WPMU_Functions/is_site_admin
It’s still used in numerous places in the BuddyPress plugin though
It will get a sweep through for 1.2.6. 
@johnjamesjacoby – I suspected you might have that one covered
Is it possible this could be causing my newly added users to get a blank white screen when they click the link within the auto-generated email once I’ve created the new user?
In testing, I find that if I’m still logged in to the admin back-end when I click the login link within an auto-generated new user email, I get the dreaded blank white screen. However, if I log out of the back-end before clicking the exact same link within the email, then the login screen comes up just fine.
Has anybody else seen this behavior? If so, have you tried replacing all instances of is_site_admin with is_super_admin and did that change this behavior?
Thanks,
Adam
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
