For future reference - the thing that was different about the image that was "unsupported" was the alpha channel:
Channel depth:
red: 8-bit
green: 8-bit
blue: 8-bit
alpha: 1-bit
Using ImageMagick convert to turn the alpha channel off made the image work properly.
!DSPAM:87,500d9d7563732042311148!
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Received on Mon Jul 23 11:42:27 2012
This archive was generated by hypermail 2.1.8 : Mon Jul 23 2012 - 11:42:28 PDT