Tracked down the apparent cause to libcairo's
debian/patches/02-cairo-1.4.8-lcd-filter-2.dpatch.

The bug reveals itself if sub-pixel rendering is enabled and  rgba_order
'VRGB' is selected.

 $ gconftool-2 -a /desktop/gnome/font_rendering
 rgba_order = vrgb
 antialiasing = rgba
 dpi = 96
 hinting = full 

Changing it to any of the other options (vbgr, rgb, bgr) using

$ gconftool-2 -s /desktop/gnome/font_rendering/rgba_order -t string
"vbgr"

and restarting Compiz (or disabling/re-enabling it) will clear the
issue.

Working on a fix.

** Changed in: libcairo (Ubuntu)
   Importance: Undecided => Low
     Assignee: (unassigned) => TJ (intuitivenipple)
       Status: New => In Progress

** Changed in: compiz-fusion-plugins-main (Ubuntu)
     Assignee: TJ (intuitivenipple) => (unassigned)
       Status: Confirmed => Invalid

** Changed in: compiz-fusion-plugins-main (Ubuntu)
   Importance: Low => Unknown

-- 
Compiz resizeinfo legend characters appear as filled blocks
https://bugs.launchpad.net/bugs/145604
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Desktop Bugs, which is a bug contact for libcairo in ubuntu.

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