Maybe the can is Metallic and the Transparent Material is actually a (Geometry) layer wrapping around the Metallic part?
Exaggerated, something like this;
Omar Domenech
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It can be multiple things, you may have a duplicated object or an extra material slot. You can upload your file for us help you troubleshoot the problem.
Adrian Bellworthy
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It could even be something to do with your GPU, I can see your GPU device grayed out, not working basically.
Martin Bergwerf
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That's because Experimental is enabled Adrian...
Adrian Bellworthy
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It doesn't grey out when I switch to experimental..
Martin Bergwerf
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Oops, my mistake Adrian,
I had a new OS installed and hadn't updated all my Preferences yet...my Cycles Render Device was still set to None.
