I did automatic upgrade from 2.7 to 2.7.1. Process went fine with no errors.
But, after that I cannot access admin section. No matter how I try, any link to admin options ends up with message: You do not have sufficient permissions to access this page.
Login goes fine, I am logged in, as I can see that in public part of the site, but I just cannot access admin section.
I changed nothing to the site except I started automatic upgrade.
Now I am stuck with this.
I searched WordPress site, and also Google and found no trace of similar problem reported.