Hello, I have a 2.0.1 installation.
I promoted someone to the administrator group using my administrator-group account.
Under the 1.5.x system, I couldn't raise him to the same 1-10 number as I was in, so I could still edit his posts.
Now I can't seem to find any 1-10 rankings, but I get the following strange behavior. I do not get an "Edit this post" link when I see his posts in the blog, but I can edit his posts if I go to Manage > Posts.
It's not really an issue in my installation, but it kind of feels like a bug, so I thought I'd mention it.