I seemed to have lost my curve selction toolbar.
It is the pull-down menu that allows choices between single curve, tangent curves, etc.
How can I bring that curve selection thing back ?
On my installation, the curve selection dropdown doesn't show up unless you are in a command that needs it (extrude, edge blend, etc). If you have lost it, you can customize the toolbar to get it back. Right click on a toolbar, customize -> commands -> selection bar -> find the curve selection dropdown and drag & drop it on your selection bar.