Just to weed out the possibility that this was an error in shadow constructions, I deleted all current shadows from the asset and started over. Built a simple box, with no extra vertices or sides. Chose a dark color from the main asset texture, and painted each side individually instead of using the flood paint. Set up the file per your screen shots. Then, exported using the Trainworks wizard and the "Rail Simulator Intermediary Geometry Format (*.igs)
shadowmess.jpg
Now looking at it in the Asset Editor... no shadows!
shadowmess2.jpg
Same asset, exported in 3DC Canvas 8, using same setting (asset still disappears)...
shadowmess3.jpg
Thanks dick8299 for taking the time to help me out with this. There has got to be something i'm missing here, but i'm reading and re-reading the amabilis and UKT forums and nothing is standing out as red-flag.
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QUOTE: "History shows that Richard at Amabilis has been very supportive and responsive."
I wouldn't call getting no support for issues with a product, and not just in this particular case, supportive and responsive. If i'm to blame for this problem because it's something i'm doing wrong, then I have no problem that; i'll fix it and move on. But when I pay MONEY for a product, I expect to be able to get a BODY on the phone or through an e-mail to tell me that i'm doing it wrong!
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