Since some recent upgrades of used libraries I'm seeing the following error from
xmonad:
| X Error of failed request:  BadAccess (attempt to access private resource denied)
|   Major opcode of failed request:  2 (X_ChangeWindowAttributes)
|   Serial number of failed request:  7
|   Current serial number in output stream:  8
| user error (Error in function getWindowAttributes)

This renders my desktop completely useless. Upgrading it locally to 0.15 fixed
the first error (BadAccess), but not the second error. But with the X error
fixed, it's at least usable again.

Cheers