I recently ran into a problem loading a rendered Carrara image in Coldstone. Long and short of it, if you set the background color to 255,255,255 (pure white, invisible to Coldstone) in Carrara, it will render out at 254,254,254, causing problems in Coldstone. I remember someone saying they had close to pure white still showing up as invisible in Coldstone, but that's not the case with me. So I sent a bug report to Eovia, and they responded telling me yeah, they get the same problem, and to use an alpha channel.
Anyway...just a tip.
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