corruption of image

[Aileen Heal]

Hi I hope you can help.

I am consuming another WMS server in my mapserver application which I am then also serving up as a WMS. I am using MapServer as an aggregration service.

I am having a problem with the image being corrupted in very unique circumatances.  Usually when I have a black filed polygon which is being overlayed with a simple polyline in s lighter colour.

THis is what the image looks like in the original WMS


This is what MapServer generates


Any ideas how I can over come this.


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