Hi , I am using Maya 09 on window xp 32(sp 3) bit machine . In PERSEPECTIVE view i m not able to rotate the grid ( alt + middle mouse button ) . Tried to use viewcube but not getting the same result as it used to be with alt + middle mouse button . Removed everything from preferences no change so uninstalled & reinstalled maya still the same . Checked the mouse in another computer works fine . All of sudden this problem has started , so anyone do know how to sort these issue .