Remark to latest Renders:

I remember times when allot of artist were presenting there art, having the dolls often with fingers in there Mouth, now things seem to be changing and they look like as if  they just about to give birth. the Art flow took a little longer then 9 month but you slowly are getting there :)

Doing the exact same steps in Poser 13 like above importing the Image allow Poser to fit window to Image and I get this in Firefly

If I render in Superfly "Just changing the render engine"  P13 it works with no borders at all 

Poser does normally a perfect job sizing the render area fitting to the background with no borders at all no matter what aspect your Image has. It sure is a time saver rather then using Planes adapting these to have a backdrop. 

For sure something that needs to be fixed ..... It can not be that prior Poser versions work better then the new flagship !

Allowed my self using your car Image ...

I Import the Image File - Import - Background Picture, select the car image " That I just cut for my preference in a Image editor size now 1714x 828 ", Poser asks " Change Window to match background " Click Yes .... Hit render 

Render no Borders, actually never had any until Poser 13 

Rendered in Poser 11

Poser 13 firefly is really messed up :(   

Tested the background setup on a back plane, this works but naturally the size will not be adapted like the background to the Image. So the Issue is only concerning the background in fiefly  of poser 13. Also tested all the previous Poser versions if they are affected with this issue in case that a Win update caused a issue but all works like a charm in older poser versions.

Meaning all the background features in P13 are broken. Render dimension setup is not working in combination with a background, Importing a new background does not work, removing the background does not work, changing the Auto_ Fit feature in the material room does not work. The background feature is actually a essential feature for final renders if not filling up the whole scene with meshes without this feature working correctly Firefly is almost useless and broken.  

Assuming that almost no one is using the firefly render in Poser 13, I tried all the above settings but it will always make a square background no matter if autofit is checked or not. The scene will certainly fall out of the background. If you try loading a new background replace it through the interface it will keep the first one, you can only change it in the material room in order to work in firefly.

So in theory all these auto features and buttons are useless if for firefly the background aspect needs to be done manually ? This would mean that the better choice is to render firefly in a Previous poser version 10 11 or 12 saving allot of trouble.

I hope that it does not also affect the texture setup on a model in firefly when rendering if the autofit is not working as it should making Images 1:1 square. Will have to test it on a square plane to see if it is only happening on the background.

Btw: Already tested by changing the Nvidia drivers 4 versions 2 game 2 normal, firefly issue remains, not a Driver issue!  Previous Poser versions do not brake the background it only happens in Poser 13 firefly. 

Try  making the "Alternate Diffuse/Specular" Darker allot darker then you should be able to higher up the specular value. Alternate diffuse/Specular ends up in Superfly as a light (or Glow) and I do not think it belongs there for a skin, it also removes any shadow from a light on the surface of your model. This should fix your glossiness

Just a guess :)

Yes Perfect! so no more issues, works just at it should this way. Thank you :)

(Issue solved)

It seems that Point light in Poser 13 are having an issue and could not be used in superfly. The setup Rhia474 would be trying to do would end up wrong as Light in a object as the " Dist End " can't be set ! It seems having no effect when changing the distances and acts like a Infinite Light in superfly. Either it is a error in Poser or Point lights are not supposed to be working in superfly. In Firefly they work as they should.

If using this Point light system in a gem like you plan it would light up the whole environment when rendering with superfly. Someone might check the Point lights Dist End to confirm that issue, else it is just on my side and ignore my comment.