Mike, I don't think UV mapping can make any difference here. UV maps are coordinate maps that tell the software "start mapping the 0,0 point of your bitmap on that vertex and with that direction". But we have no bitmap here to map. We have a procedural material. It is indifferent, to the effectiveness and quality of the texturing, whatever starting point it is mapped from. Not just that, but I suspect that, if "procedural" is selected instead of "mapped" (which happens automatically if you assing the cloud materials, as they are obviously preset as procedurals), Vue will even completely ignore the UV mapping information that might be present in the file. There are other things that might be better "suspects", as the normals direction, or the number of sides of the object (single or double) although this last thing too, should be "overset" by the application of the clouds material. Very obscure indeed...