Akismet "You do not have sufficient permissions to access this page."

Akismet was working. I have an Akismet key. But now I cannot get into Akismet Configuration. When I try, it gives me the message:

"You do not have sufficient permissions to access this page."

I have deactivated all plugins. This error occurs on my large installed site and also on my brand new squeaky clean site that is not even running yet.

Any ideas?

Ed