Around the bottle are some round carvings. I created these with a Difference Boolean with a torus. I've hidden these torusses (tori?) from the view and renderer.
However, when rendering (with Cycles Render), I see some weird shape, like one of the torusses isn't really hidden. When looking with the rendered viewport shading in 3D view, I don't see the extra torus (which is what I expect).
What could this be?
Modifiers applied to the bottle, in order: subsurf, 8 booleans, solidify.
EDIT: I've doublechecked all modifier visibilities and the visibilities of the torusses themselves, and I don't see anything odd. See the image below.
Additional info, I made the torusses by extruding a circle over a circular beziercurve, and creating a mesh from that.
EDIT2: I've added the Blend file to the top of this question