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Hello, Tony, so, this is a known bug, then? I'll get the latest version, thanks!

Hello, I am a Maya user recently learning 3DCoat, and this is my least -but surely not last- newbie question: I am following this tutorial series, pretty good: I am making a simplified version of the hammer, without the cord and the ring. Anyway, I have already done my retopo, everything working fine there, until I want to make my UVs. The problem is, I can't create UVs at all, I have 2 circular island automaticaly created from the sphere object used to retopo my gem at the bottom, and I can delete those, but I can not make any other UVs. I am supposed to hit "unwrap"... I have tried selecting every layer, selecting the polygons, selecting the entire object, I hit "unrap" and nothing happens. Also, my objects is not showing on the UV room -shoul it be there if I don't have UVs?-. I am using 4.7.10. Thanks in advance.