MEB, when I press Close Curve I get my O back instead of a C. I even turned the end nodes until they almost touched and they still jumped the long distance to where they were when I broke the curve. I tried selecting the curves and I tried selecting all nodes in both curves. No difference, still O's.
I then tried to snap the end nodes from both curves together. Pressed Close Curve and it still completed the O just very misshapen. The inside curve tried to heal and the outside curve tried to heal.