I found out that some images generated in earlier versions of Photoshop (CS4 and CS5 for example), appear on the screen of the Poser when imported. Other images generated in recent versions of Photoshop, (CS6 for example), does not appear.

The images that appear on the screen of the Poser, when I give the command "File/Import/Background Picture", a window appears: "The background width/heigth ratio is different than the current window ..."

By clicking “Yes”, the image appears.

When I run the render command, the job is render on the background image imported, however, the shadow does not appear, (I believe this is because I cleared the option "Display/Guides/background plane), but I don’t know if my guess is correct.

By the way, I apologize for my bad English. You might have noticed that I am using an automatic translator.