Just watched a really poor SK win because two other players were AFK. At the end, he killed one and the other quit after being silent the entire game. No one could get the votes to hang him for several nights because of the AFK people who never did anything, but stayed connected for the round.
I believe this was someone with two other windows open.
Solution: Kick people who don't talk, select anyone, vote, etc. over the course of two or three nights.