Admin theme breaks when set to blue skin and then upgrading to 3.1rc2
On a new install using this guide, I switched the admin theme to the blue skin and then performed the upgrade from 3.1 to 3.1rc2
After installation, I could access the admin theme but it wouldn't allow me to do anything. The only option was to log out and even that didn't work. I should have taken a screen shot but I didn't unfortunately.
I've since wiped and redid the server but I'm sure the issue is easily reproducible.