Quote - Any news about this bug?

I like to render over photographs and the working alpha channel is a great tool when doing postwork.

I've been out of the loop for a while, so apologies if this is a dead horse!

 

As I discussed in the above, it isn't a bug. What I would recommend is to use the background for composition, and then perform two renders, one without the background (just make it transparent), and one with just the background, and then composite them. It's a bit of a pain compared to what the workflow is in P6, but it has the following advantages:

If you decide to change the background (make it black and white, use a different background etc.) the clear parts of the objects in the render will show the new background, not the old. Also, there won't be a halo effect around the edges of semi-transparent objects such as hair. (Before, if you rendered dark hair against a light background, and then composited it against a dark background, the hair would have a light halo around the edges where it had partial transparency, and the image would have picked up some of the background.