Hi,
Thank you a lot every one there.
I finally found the mistake (if I did'nt post the problematic file it
was because it is a 700 line sty file I had written for use with pdftex)
It was the use of a \renewcommand*\sfdefault{ugq} somewhere...
The strange thing (to me) is that when I was not using xltxtra (and
thus when I was still using package helvet) compilation with xelatex was
working very nice except that œ character not taken by latex (i.e. cœur
gave the word cur).
Now, I am just searching for a replacement police for helvet that
support smallcaps (and to understand what was I intending to do with the
problematic \renewcommand*\sfdefault{ugq})
Thank you again, your help was efficient.
Best regards,
--
D.
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