Before I needed to reinstall Win/Poser, becasue of an infected renderosity link; if I used the Area Render, from the Render Panel, then the finsished Area Render would include what was previously render in the Render Panel, around the border of my Area Render.

Does anyone know why this does'nt happen anymore?

Illustrated are two consecutive renders, and a composite; Full Render, Area Render, and Expected.  To get the third(expected) frame, of this animation, I needed to composite the first two(with photoshop.)  But I would have epected my third frame(Expected) to have been my result for the second frame(Area Render.)  Granted there were always some scratchy lines over where exactly the Area Render was used, over the previous(/now background) render; but this was negligable, considering lots touch-up work.