[XeTeX] ColorSync problem

[Bruno Voisin]

I've just been faced with this strange situation: typesetting a 
document in XeLaTeX with TeXShop, the console log end up with:

(./ENS-2005-02-27.aux)Error creating cg colorspace from csync profile )
Output written on ENS-2005-02-27.pdf (1 page).
Transcript written on ENS-2005-02-27.log.

But, oddly, no .pdf file has been created! Looking in Console at 
system.log, here's the corresponding output:

Feb 28 00:07:00 localhost xdv2pdf: GraphicsImportGetColorSyncProfile 
was called for an image that has a ColorSync profile, but the base 
graphics importer will perform ColorSync matching, so a generic profile 
is being returned to avoid incorrect matching.  To opt out of automatic 
ColorSync matching and access actual embedded profiles, set the 
kGraphicsImporterDontUseColorMatching flag.

The document that I was typesetting is a letter, containing a JPEG logo 
plus some text set in color using the color.sty package.

Can something be done to avoid this problem, or is it, at this stage, a 
XeTeX bug?

Bruno Voisin