I had the same thing happen when posing several thick walled glass decanters together, I changed the lighting ever so slightly and the next render was ok, but it comes back sometimes for no reson, buggy,buggy,buggy....try a different glass texture, might help, ooooooo, wait a minite, ask FWTempest, he has those packs of glassware, if he's run into this type of thing in his renders.....

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