Zooming graph changes start offset
If you're showing a particular area of the timings graph and then change the zoom level then the start offset of what you see changes.
This is most easily seen by scrolling to somewhere in the middle and then selecting a range near the left of the window, and then click '-'. IMHO we should still see the range selected at the left of the window, instead it disappears out of screen and you have to scroll a lot to find it.