I used to have a similar problem in P7 firefly: There would be bucket-sized holes in the image in the alpha channel, usually in a streaking pattern. I discovered that these 'holes' were patterned on geometry that was behind the camera. They finally fixed it with SR-3.

Until SR-3 I could avoid the problem by making sure no props, figures, or other geometry like lights were behind the camera or intersecting it. If nothing is behind the camera and these 'bucket holes' still happen to you then I would guess it is a different problem, though it seems very similar.

Quote - Trouble is, these scenes often have copyright content in them, such as V4, so I don't give them to SM, under the assumption that I'm not allowed to. Maybe I'm mistaken and it is allowed. Further, I'm sure somebody at SM already has V4. But I don't know what is permitted.

When I was having this problem I sent an example scene to E-Frontier using the 'collect scene inventory' script -at tech support's request- which had some non-E-Frontier props in it (they knew it contained content from a different company). I was under the assumption that sending content in this manner to Poser tech support for bona fide debugging research is a very rare occasion when giving copyrighted material is legitimate. I would also assume that Poser tech support would act ethically and only use the scene and content files to resolve a customer issue and not for any other personal or commercial use.