Thanks to all for the suggestions. In this case, I found and removed a check mark by "snap to" and Audacity seems to be its old dependable self again. Have to say, this was worrying the heck out of me and really created a problem in editing tracks for the radio show this week. Thanks again to all. I try not to run a lot of other stuff when working with sound files, but will admit I get careless from time to time.