Reply To: Lost admin access after 2.o update
Really peculiar. Anything can happen, of course, but I’d be very surprised if upgrading BP demoted your account somehow.
This is kind of a long shot, but have you tried clearing your cookies and trying again? I wonder if there is some sort of mismatch with your auth cookies (especially if SSL/HTTPS is involved).
Is your site a multisite network? If so, are you attempting to log in with a super admin account, or just a regular site administrator?