Fixed my own problem. I discovered while attempting to throw away my old incomplete file (in disgust) that I didn't have priviledges, it had been created when my wife was logged in, even though it was in my home documents folder (which we share). Logged in as her, turned the priviledges to group-read & write and voila! I feel kind of silly, but I am still getting used to how OSX/UNIX does things, so I can forgive myself.