It occurs on Matrox cards too. And it appears on .daz figures in the supplied content (but in white), so it's not the Poser import. Rob W felt it was related to lack of memory on the OpenGL card (I've 32MB), but I didn't get him to give guidance on how much was enough.

Also in my case it remains transparent if I only have 1 (smallish in file size), add a second or use a larger character and it goes red or black - always same colour for given characters.

My hunch is that it's a coding error in Studio (Matrox OpenGL implemenation is used in many workstations), but if not it's unlikely to get fixed per se, as the response would be a simple (from Daz perspective) upgrade your card/driver (not possible in my case).

However, all may not be lost - there have been requests from the outset for those "control balls" to be made optional, via a prefrences or a hot key, from those users without this bug. They just want to be able to look at a clean image in the scene window. IF that enhancement was added, then the solid spheres could be hidden by those of us experiencing them, and adjustmenst made using the dials. Otherwise, as indicated, even using the dials is not an option - unless you like making adjustments to hidden actors :-O