One thing I see is that you can not save transparency to jpg, that format doesn’t support transparency. Instead you should use a format like png or tiff. Having said that, the result you are having is not expected IMO, you should be getting the image with the background but not black.
I did a few tests and I’m also experiencing problems with this. This is running the latest WIP
1.ViewCapture_TransparentBackground saved as png
2.ViewCapture_NormalBackground saved as jpg gave me a blank image
3.Rhino-Render_NormalBackground as png
4.Rhino-Render_TransparentBackground as png
5.Screenshot of raytrace viewport
@nathanletwory I think images 3 and 4 are incorrect, it’s more noticeable on 4. They shouldn’t have those ambient occlusion shadows around the silhouette as if the building was placed on the ground, there is no ground in this image and there shouldn’t be any kind of contact shadows around it as you can see on image 5 screen shot.