vector over raster not displayed correctly

[luca marletta]

Hi All,
I have several vector layer and some raster, a map and an orthophoto,
TIF format, I'm using mapserver 4.8.
When I overlap vector to raster (they are in different layers and
groups) I have just labels shown above and I cannot get why I'm not
able to see line and polygons.
My question is there is some rules to respect for such overlaying?

Thanks for any suggestions

luca

-- 
luca marletta