The first image shows a scene rendered using Superfly.  The second is the same scene rendered in the background.  There are two lights in the scene: an infinite light that illuminates the outdoor area and a spotlight used to light the stairway inside the door.  It looks as if the background render did not use the infinite light.  The problem doesn't occur with the Firefly renderer, although the figures look a bit odd since I have used Cycles nodes.  

Has anyone else had this problem?  I have lodged a support ticket with Poser.

System:
i5-11500 @ 2.80 GHz
16 GB RAM
NVIDIA GeForce RTX 2060
Win 11 Pro 22621.1702

I should have added that I am using Poser 13.0.296.  

Also, the problem occurs when I use either the CPU or the GPU to render the image.

To back sure I understand the problem, are you referring to the black around the doorway as if there's no light? I don't have that problem. I'd look and make sure you don't have anything blocking the light.

it seems to be that Infinite light glitch in Poser13, sometimes it just turns off and you get a black render ! Often by moving the infinite light. It normally works again by moving the Light just a little and it turns back on. In some cases a really annoying issue. Also like in previous Poser versions the Spots keep on vanishing and you have a hard time locating these to move by hand even if you have em set a visible. So in Poser13 quiet some things seem not working stable concerning lights and the contrast change after a render, that can be awfully annoying.

so pretty much normal getting a black render in Poser13 with infinite light after they periodically crash ! just have to be getting used to it .... 

it seems to be that Infinite light glitch in Poser13, sometimes it just turns off and you get a black render ! Often by moving the infinite light. It normally works again by moving the Light just a little and it turns back on. In some cases a really annoying issue. Also like in previous Poser versions the Spots keep on vanishing and you have a hard time locating these to move by hand even if you have em set a visible. So in Poser13 quiet some things seem not working stable concerning lights and the contrast change after a render, that can be awfully annoying.

so pretty much normal getting a black render in Poser13 with infinite light after they periodically crash ! just have to be getting used to it .... 

it seems to be that Infinite light glitch in Poser13, sometimes it just turns off and you get a black render ! Often by moving the infinite light. It normally works again by moving the Light just a little and it turns back on. In some cases a really annoying issue. Also like in previous Poser versions the Spots keep on vanishing and you have a hard time locating these to move by hand even if you have em set a visible. So in Poser13 quiet some things seem not working stable concerning lights and the contrast change after a render, that can be awfully annoying.

so pretty much normal getting a black render in Poser13 with infinite light after they periodically crash ! just have to be getting used to it .... 

Thanks!  I deleted the infinite light and created a new one, and now background rendering works again!  I agree, the new version of Poser is still a bit wobbly.  It has some good features, though.