There is a goofy bug that apparently doesn't affect all systems regarding the Alpha Mask. Before Metamorph... er Creations that is, went away they gave me this work around. In the Render Room, get everything else set the way that you want it. Then in the Format selection choose>Movie (the radio button). Then, from the Movie pull down that appears, select Sequenced Photoshop file. Next you can go to the G-Buffer area and select Mask which otherwise is disallowed. Then go back to the Format option and select Tiff or whatever format you want to render in (uncheck Movie) and the Mask G-Buffer option will be retained. The alpha mask will give you a solid object mask (unlike distance) unless there is transparencey in one of the objects being masked, in which case a grayscale version of the transparency is created. Hope that this helps. Mark