This may have come up before, but it has just frustrated me again, "Paste onto background" is messed upin wireframe and outline display modes. It fills the outline area with background colour, so I can't paste one outline image over another for onion skinning/reference.

The same thing and worse occurs in png renders in preview mode. I did regullarly export clips of single body parts in outline mode with joint centre/origin visible for motion tracking in Moccha/Hitfilm but now the background colour fills the outline and obscures the crosshairs of the origin. Just to add to the weirdness, it does this from the 2nd frame, 1st is as previous versions of Poser a transparent image with just outline and origin visible.