It looks like you have broken coastline polygons (processed_p.shp)  . I
have seen similar artifacts on openstreetmap.org recently.

On 12 December 2011 19:10, Dirk Stichling <mytracks4...@me.com> wrote:

> Hi.
>
> I have setup a mapnik rendering server and it already works quite well.
> But there are some strange things as you can see in the following example:
> http://www.mytracks4mac.com/screen1.png
>
> As you can see the sea is sometimes blue and sometimes not. I also have a
> similar effect in other zoom levels where the forrest is sometime green but
> sometimes just grey.
>
> Do you have any idea of what is going wrong?
>
> Thanks,
> Dirk
>
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