When you click on General Settings, is the checkbox "Keep source geometry influence." activated ? if yes uncheck it and click on save settings, then create your pipe again to see if it works. If it doesn't i would recommend you to create a new scene and try again in it.Sometimes certain operations in Maya interfere with…
It would be nice if there were an interactive mode for this...kind of like bevel, extrude, and most of the other built in modeling tools where there is that popup that lets you adjust the parameters of the tool. The way you're doing it by executing the script command again to cycle through the attributes does save me from…