I noticed this is Zen 7 img (GUI interface) and it is also in Sp1.

For any of my Dell models (gx260, 270, 620), attached to a dell 17" display
(1280x1024 native), USB dell mouse, when the GUI version of IMG is loaded,
the mouse will not track to the bottom 1" of the display.

Not a big deal since I tend to use the keyboard shortcuts, but something to
put on the "to be fixed" list.