I was hanging out with a someone.  They happened to have 2 instances of hangout running (one on a computer, one on phone). I was getting annoyed at it switching between the 2 video feeds, and thought I could solve it by clicking the "block" button.  Instead, the hangout stopped working, and now I can't hangout with them because it says they are blocked. But if I go to my circles and click "View Blocked", they don't show up so I can't unblock them. So I can't hangout.