The problem appears to be caused by what page has the cursor on it when you do this. I just tried it and had some "interesting" results if the cursor wasn't on the first page. For instance, I created a document with three sections, each a page long. If the cursor is in the second section, my numbering looks like so - first section (numbered 1), second section (nothing), third section (numbered 1). If I have the cursor on the third page (third section), the numbering is as follows - first section (numbered 1), second section (numbered 2), third section (nothing). If I have the cursor on the first page of the document (first section), I get the proper numbering - first section (nothing), second section (numbered 1), third section (numbered 2). It would seem then that the cursor has to be on the first page.