"Random" background colour/transparency on urxvt windows (XMonad)

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https://bbs.archlinux.org – It should not be possible for them to be layered in xmonad (unless one is pulled to floating ... in which case it'd be highly unlikely that it'd land in exactly the same position as one underneath it).How do you spawn the different instances?  Are you using default keybindings?  Do you use dmenu or another launcher?  What's in your Xmonad.hs?  Is it possible that one of these is an xterm?I'm not sure if/how this would be related, but have you considered using urxvt's daemon mode?  You may get different symptoms that help in the trouibleshooting (HowTos)