Michael, just noticed something...

It's not a bug, but a request:

When running the Extrude command on a curve or a line (not a surface) it wants to default in the Z direction to make a surface from the curve.
Sometimes it throws me for a loop when nothing happens right away in a non-Z view port. "Why always Z?" (I exclaim).

This is when you would normally implement the [Set Dir] option.

I'd like to suggest a couple of tweaks to Extrude (curve).

Allow for automatic direction setting to correspond with the ortho view you are in. Or at least in vertical and/or horizontal direction, so that something happens right away.
Or better yet, no matter in which view, allow for an automatic direction set according to which 90 degree axis direction you carry the mouse pick in from the origin of the extrude of the curve.

Nine times out of ten, this is usually what you want to do when extruding a curve. When you need a special direction, then the [set dir] button is where to go.