It is most likely the following upstream bug of Ghostscript:
http://bugs.ghostscript.com/show_bug.cgi?id=690189
** Package changed: cups (Ubuntu) => ghostscript (Ubuntu)
** Changed in: ghostscript (Ubuntu)
Importance: Undecided => Medium
** Changed in: ghostscript (Ubuntu)
Status: Incomplete => Triaged
** Bug watch added: Ghostscript (AFPL) Bugzilla #690189
http://bugs.ghostscript.com/show_bug.cgi?id=690189
** Also affects: gs-gpl via
http://bugs.ghostscript.com/show_bug.cgi?id=690189
Importance: Unknown
Status: Unknown
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[Jaunty] Transparent areas are printed in black
https://bugs.launchpad.net/bugs/362641
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