Quote - Render settings...

The only thing that was changed are the gamma settings. I did not use IDL.

 

Poser has 2 and probably more than two places where gamma can be changed.  The Gamma Correction in the render settings is not the actuall gamma setting.  Think of Gamma Correction as the setting that you use to add more or less Gamma to what is already there. 

The best way to understand this, if you have Poser Pro 2012 (not sure if it's in Poser 9), is to go to Scripts -> Partners -> Image Gamma.  This will show you the gamma that the materials already have.  Chaning the Gamma Correction settings will either add to or decrease what is already there.  For example.  If the Gamma on the material is 2.2 and the Gamma Correction in the render settings is 1.5.  Then you have to combine (take into account) the 2.2 gamma that is already on the material with the 1.5 additional Gamma that was applied.  Don't ask me to explain the math.  I just know what happens when it's done.

The same Gamma Correction setting will produce different results based on the gamma setting that is already applied to the materials.  If you are getting image burns when you render at a Gamma Correction = 1 then it's because there is gamma in your materials.