A problem many people have is accidentally duplicating splines. If there is more than 4 or less than 3 splines it won't work. Check the box at the lower left of the interface after you make your selection to verify that only three or four splines are selected. Also, make sure that the points that two splines share are welded.
The parallel and perpindicular numbers are based on the order you select the splines. The first spline selected determines what is parallel and perp. Also the direction you select will define the direction the polys face. I believe if clockwise selection is made then the ploys face away from you... not sure but a quick experiment will show you which is which.
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