the problem was the original size.
I used real size (200x40 cm) to makes it easier with the banner
printer, but for any reason the inkscape pdf writer (cairo) didn't
like it or acroread didn't (I can't know)
I downsized the image in inkscape (object, transform, then adapt the
page size) and now acroread read the doc.
being vecto document, the said size have little importance :-)
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