Public bug reported:

Using Xubuntu in a dual head configuration, the problem has been present
since at least 11.10.  When logging in, one of the two displays will not
show graphics for window decorations, just solid black blocks in the
size of the decorations.  The other display will show decoration
graphics normally.  Going into the settings manager and making any
change to the window manager appearance (including selecting a new style
then re-selecting the previous style) results in the graphics displaying
properly on both heads.

Before and after screenshots attached.

/usr/bin/lsb_release -r
Release:        12.10

apt-cache policy xfwm4 nvidia-current
xfwm4:
  Installed: 4.10.0-2ubuntu1
  Candidate: 4.10.0-2ubuntu1
  Version table:
 *** 4.10.0-2ubuntu1 0
        500 http://yow-mirror.wrs.com/mirror/ubuntu.com/ubuntu/ 
quantal/universe amd64 Packages
        100 /var/lib/dpkg/status
nvidia-current:
  Installed: 310.19-0ubuntu1~xedgers~quantal1
  Candidate: 310.19-0ubuntu1~xedgers~quantal1
  Version table:
 *** 310.19-0ubuntu1~xedgers~quantal1 0
        500 http://ppa.launchpad.net/xorg-edgers/ppa/ubuntu/ quantal/main amd64 
Packages
        100 /var/lib/dpkg/status
     304.51.really.304.43-0ubuntu1 0
        500 http://yow-mirror.wrs.com/mirror/ubuntu.com/ubuntu/ 
quantal/restricted amd64 Packages

Does not appear to be influenced by turning on or off display
compositing.

** Affects: xfwm4 (Ubuntu)
     Importance: Undecided
         Status: New

** Attachment added: "Before screenshot"
   
https://bugs.launchpad.net/bugs/1082139/+attachment/3441401/+files/Before%20-%20Screenshot%20-%2012-11-22%20-%2009%3A05%3A19%20AM.png

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https://bugs.launchpad.net/bugs/1082139

Title:
  Window decorations solid black

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