I've spent a good deal of time trying to map a symbol that contains (live) text with a drop shadow onto the exterior of a ring-shaped object, and it makes part of the symbol de-render, leaving the 3D shape exposed underneath. It seems like blur effect in the drop shadow is the culprit most of the time, but I have another ring in the same document with live drop-shadowed text that renders perfectly fine. Outlined or live text doesn't seem to matter.
It also doesn't render the images (which have clipping masks). Sometimes they do render, however. Sometimes they do not. It seems almost random.
I realize Illustrator isn't made for 3D, but it's my only option, and it seems to work some of the time, which is what's so confusing. I can't figure out what would cause it to only partially render. Anyone have similar experiences, insight, or workarounds? Rasterizing the symbol doesn't do much. The whole thing de-renders.