An annoying problem has cropped up:

When moving the cursor to any particular point on the timeline, a loop region is created around the event. In the past it required a deliberate double-click of the left mouse button either ON the event, or in the space BETWEEN two events---but now, clicking anywhere in the timeline (on a track, or the gray area beneath the bottom track) will cause an unwanted loop region.

Any suggestions on how to get things back to normal? I'm running Vegas 5.

Thanks in advance.