Hi,
I have come across a couple of bugs when zooming into a plot

1) if you goto draw a box (to where you are going to zoom) it will zoom in fine
but if while drawing the box you release the mouse button BUT continue to move the mouse the zoom does not function (when mouse stops) and a black box is drawn in the plotting window

2) If you just keep zooming in eventually you get to a point where the graph just doesn't make sense.
I mean if you plot a slope and keep zooming in smaller and smaller you eventually get to a position where you suddenly get a "triangle" shaped plot