Re: A really Dumb question...
It could be a normals problem and pressing 'n' to view normals (or settings all surfaces to be two sided) may reveal this - but it's more likely that you revolved a line rather than a poly.
If you want a solid shape from a revolution that's less that 360 degs, you should revolve a poly rather than a polyline.
if it's too late to go back, select the verticies along the edge and use ;Vertex->create ordered surface; to create a surface over the end.
Andy
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