Hi Ced, the problem is the Ctrl+L script only selects edges. Edges are a special category of curve, an "Edge curve" is part of the trimming boundary of a face. A "Standalone curve" is an independent object not connected to a face.

In your file you have these 2 types of curves overlapping on top of each other, you've got the original "Standalone curves" that you initially drew, and then after you did the extrude there are also "Edge curves" of the extrusion overlapping that same area.

You're getting the standalone curves selected when you click there, you're not getting the edge curves selected. Try hiding or deleting the original generator curves so you don't have anything right over top of your edges anymore so you can target the edges.

You can also look at the object type indicator in the upper right corner of the window to see what type of objects are selected. It will need to read "2 Edges" selected in order for the script to do anything. If it says "2 Curves", that means you have standalone curves selected not any edge curves.

- Michael