Quote - Has anyone tried saving a background render in .Tiff?

Works fine for me here. There is one change in SR2 though - by popular demand, Poser now does not discard the alpha channel any more when rendering with FireFly over a background image. So depending on what software you use to view the TIFF, it might look like the background is missing. The reason would be that that software applies the alpha channel before viewing (Microsoft's built-in viewer does that for example, whereas ACDSee and Photoshop hide the alpha channel)