[xmonad] Issue 509 in xmonad: Sometimes cannot switch focus using keyboard shortcuts

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Comment #1 on issue 509 by jeffa... at gmail.com: Sometimes cannot switch  
focus using keyboard shortcuts
http://code.google.com/p/xmonad/issues/detail?id=509

Likely the same bug as  
https://code.google.com/p/xmonad/issues/detail?id=97. In particular, see  
comment 25 on that bug.

This bug is also reproducible using Greg's method:
* create two terminal windows
* continuously switch between them by holding M-S-j
* xmonad stops responding to keyboard input within about 30 seconds

His workaround also seems to work here: comment out your "logHook =  
dynamicLogWithPP $ xmobarPP" section in xmonad.hs.