I got it to work. After you mark the start and end times for the section (or whole film), you must use the copy button next to the other section marking buttons. Then you can save the marked section as a new filename and all it good.
Only issue with saving a section, it that the bug with CV position/direction is made worse. Case in point, from my plane a CV group is steaming the wrong way, but at least was where it was supposed to be. After copying a 10-minute section from a 1+ hour film to make setting up attack shots easier, that CV from my plane is now over a mile away but the ack is still firing from where the CV was supposed to be.