We had 2 key doors left and a guardian door. 2 people were standing around. 1 person was helping me. I was running 3-4 doors at a time and killing a guardian door.
Unrelated, but, Katy! Deanna/Froud figured out her Skype problem... despite how sucky it is.
When you get this message/see this message, try to see if your firewall is blocking Skype.
My firewall decided that it didn't like Skype, and it blocked it. Without telling me. Even after my uninstallation of Skype. And my restarting of the computer. Twice.