Since updating to Ubuntu 14.04 / xmonad 0.11, I’ve had a strange issue where Google Chrome would appear to repaint itself, no matter which workspace I was on. I couldn’t interact with the window, but it would obscure what I was actually trying to work on.
It turns out, it’s a bug in Chrome. To fix it, launch chrome with the --disable-gpu flag. Here’s the relevant line from my config:
, ((mod4Mask .|. shiftMask , xK_Return) , spawn "google-chrome --disable-gpu")