Green bar going 2 inches left of where I click

Suddenly now when I click on the video timeline instead of the green bar going right where I click, it goes like 2 or 3 inches to the left, all the time. I even restarted the computer and it still does it. Right click works normally though.

Windows vista, blender 2.71

This issue is only happening on a specific blend file (actually the last few versions of my project). If I create a new file or open an earlier file the issue isn’t there. I’m editing a movie. If I roll back to an earlier file that doesn’t have the issue I will lose a bunch of work.

More specifically, it’s not “2 inches” (that changes depending on your zoom level) it’s about 13 seconds. The green bar goes 13 seconds to the left of wherever you click it.