I drew a spline, lofted it, then tried to put it in the extrude nurb and nothing happens. I threw a reqtangle shape in the extrude and that works. i drew a simple circle an that works. i put the loft in a connect but that didn't do anything. I think I'm missing a step.
doing a loft of a spline and then extruding (I assume for thickness?) won't work, as the extrude takes splines as input and if the directions of the spline and in the extrude are set correctly the extrude gives you thickness.