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In the latest version of maxwel, if you try to setup a car headlight-glass..

so you have the bumpmap applied to a poly-selection for the backside of the glass, and no bump for the frontside, then the bug occurs.. weird refraction and the bump map is almost invisible. I tried every parameter/map-type I could think of to get rid of it, but problem remains.

Could you please share an example image and scene?

Here you go, this file probably isn't great for testing but you can see the problem at least.

http://www.mediafire.com/download/3bpbi ... hwk/tom.7z