Autocad to pdf solid fill issue

Hi
I don't very often use solid fills but noticed recently when I pdf'ed a drawings containing solid fill that the subsequent pdf (viewing in acrobat 7
& 8 - I have not tried earlier versions) shows the solid fill with a visible diagonal dashed line across the fill, which I presume reflects autocads internal island analysis of the filled shape.
In acrobat reader 8, under Preferences- Rendering if I untick 'smooth line art' the diagonal dashed lines disappear, however, I then loose smoothness of any curved lines within the drawings.
I have also noticed the same thing in other pdf'd autocad drawings on the web, an example of the type of thing that I am talking about can be found at:
http://www.savills.co.uk/residentialSearch/a049fda9-67cb-4219-8cea-abb77e4f9b86-0-1-0-viewDetailsSubmit/residentialSearch/propertyDetail.aspx?pID 5962
http://preview.tinyurl.com/yorr47
http://tinyurl.com/yorr47
Click on floor plan link which brings up a pdf'd floor plan with the walls filled with a solid fill
Can these dashed lines be controlled/omitted from within autocad?
Thanks
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http://www.savills.co.uk/residentialSearch/a049fda9-67cb-4219-8cea-abb77e4f9b86-0-1-0-viewDetailsSubmit/residentialSearch/propertyDetail.aspx?pID 5962
I got rid of the lines with Adobe acrobat by saving the file as a tiff and then reconverting the tiff back to a pdf.
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