Hi guys need some advice. I have upgraded to poser 13 from poser 12 and I'm having a problem I can't sort.

When rendering a scene using a background picture there is a plain strip either side of the render. I have tried to match background picture size to render size tried different image formats and different size images and nothing is working.  Where am I  going wrong.  Any help appreciated.  Did not have this problem with poser 12.

Thanks in advance.  Donna.🙂