Strange... sorry to hear it doesn't work for you.
I'm actually going through this exact scenario as I'm writing this:
I'm zooming in, left-click-drag the mouse downwards in the time ruler while the track is running.
At one point the vertical time line goes past the right edge of the window.
Now I right-click in the time ruler and the time line comes back from the left edge.
When I first recognized this behavior I thought it was a some kind of bug, until I learned it's actually a feature. You'll get the same sort of thing in the PRV when editing while the track is running.
Sorry I can't be of any more help at this point.
regards
Daniel