I can't figure out how to build an aesthetic road. I already have a road complex, and when I try to build an aesthetic road I have a nice green footprint showing that it can be built built when I click to place it nothing appears. I'm sure I'm doing something crassly stupid, but what is it?

You have to click and drag at least two tiles along the length of the road to place them: you cannot have a single tile of aesthetic road.

Superb! That's what I was doing wrong, Thanks!