Hey guys, I'm not sure what's going on with my mouse, or if it's even a result of upgrading to 15.5. Before, while on 15.2, clicking the middle mouse button would continue zooming in if I had just zoomed in. If I had just zoomed out, the middle mouse button would continue the zooming out when clicked. Now, clicking the middle mouse button zooms me in, whether I just zoomed out or in. Not a big deal, but anyone have any clues as to where this is set? Thanks! Gary E. MacIndoe PCB Design Engineer Advanced Micro Devices Longmont, Colorado