no raster layer with ps.map

Hi every body.

I have a little problem. I am trying to generate a Postscript map with
ps.map, but nevertheless select one raster layer, the obtained map
doesn't match it. The problem doesn't happen with vectors layers and
other parameters (grid, lines, etc). I tried ps.map in-line and
specifying a parameters file, but the problem persists.

Could someone help me? thanks.

--
Alexandre Rodier
    INUAMA
Universidad de Murcia
Campus de Espinardo
30100 - MURCIA -
   - SPAIN -
tel: -34 968.31.48.46
alexrod@fcu.bio.um.es