I don't think that's a function of colors, Jeff. That sounds to me like some kind of highlighting or selection problem. But what do I know, I never use the preview pane, that would slow down my post count immensely!!
Well, I didn't know quite where to post the question--wasn't even sure how to ask it--and then I saw this thread about color, so. ...
It just sort of happened when I was posting from work this morning. And I'm not aware that I "clicked" on anything to change anything. But apparently Amanda is seeing something different, too.
(OK, I just hit "Preview" to check this post, and the pane is still dark gray, so it isn't something related to my office PC or its monitor, because I'm writing this from home.)