Can't Set Main Site w/ Global Tables

Hi guys,
I can't set the Main Site on Membership while it's Network Activated with Global Tables enabled. Whenever I try to set it via Blog ID in wp-config, it says "you do not have permission to access this page" when I have FULL Super Admin permissions set in the system.

I really need to set my main site in order to create a Member Center for my members. And I don't want the member center to be on my main site, which is really for visitors.

I know it works, because it worked perfectly on Membership Lite. Can you help me get this fixed?