A number of people wrote to tell me that John Norstad has released NewsWatcher 2.0b3 shortly after TidBITS-233 came out, mentioning 2.0b2. The Internet moves quickly, and something in one issue may be out-of-date by the next (although I'm usually correct as of the day the issue is dated, since I check URLs during editing). You can get NewsWatcher 2.0b3 (and subsequent versions in the same directory) at:
Mysteriously Moving Margins in Word
In Microsoft Word 2008 (and older versions), if you put your cursor in a paragraph and then move a tab or indent marker in the ruler, the change applies to just that paragraph. If your markers are closely spaced, you may have trouble grabbing the right one, and inadvertently work with tabs when you want to work with indents, or vice-versa. The solution is to hover your mouse over the marker until a yellow tooltip confirms which element you're about to drag.
I recently came to appreciate the importance of waiting for those tooltips: a document mysteriously reset its margins several times while I was under deadline pressure, causing a variety of problems. After several hours of puzzlement, I had my "doh!" moment: I had been dragging a margin marker when I thought I was dragging an indent marker.
When it comes to moving markers in the Word ruler, the moral of the story is always to hover, read, and only then drag.