Before I start, I have to admit that I am a completely new to PhotoWorks and just trying to do a few renders with the help of a book. I would like to render a view looking through 3 or 4 parallel panes of glass in an assembly. I have the photoworks clear glass material assigned to parts, and it works fine through 2 layers, but if I add a 3rd pane, the assembly is opaque wherever all 3 overlap. I actually have only 1 part file for the glass, inserted multiple times in the assembly, so I know there is nothing wrong with the material assignment, or it wouldn't even work with 2 panes. Any Ideas? Thanks.