I was wondering about this alpha channel problem, so I did some meager testing using the default factory scene rendered with the default Firefly settings. Now remember, this topic is regarding alpha channels from P7 renders with background images. Initially, the PSD and TIF alpha channels were showing up when rendering w/o background images. But that's not the issue. I made some renders WITH background images and no alphas! I deleted the background image, and subsequent renders also had NO alpha channel, whether they had BG images or not. I quit P7 and restarted, rendered, and alpha channels worked again. I tried the "Paste onto Background" feature, rendered, and the alpha was fine. I deleted the "Paste onto Background" image, and tried another via File>Import>Background Picture. Once again, rendering with AND without BG images, no alphas. I closed the file, and made a New file, rendered the factory default, and alphas were back. There definitely seems to be a problem with P7 befouling alphas thanks to BG images, but I can't pinpoint why. Any thoughts? Edit: Mac G5 Dual 2.5 GHz OSX 10.4.8 8GB RAM