>I am using the mouse on a laminated desk surface, which simulates a maple >wood finish. The surface is therefore of non-uniform color - there is a wood >grain look to it. Do you think that might be influncing the optical reader >to jump the mouse cursor? I don't think it is the grain, but more likely the finish, which is refracting the light rather than reflecting it to make the mouse think it is moving when it isn't. This is just my semi-scientific understanding of light and the fact that moving to a non-reflective mouse pad solved my similar problem, and the same problem that a colleague was having. -- <><><><><><><><><><><><><><><><> Mike Bigley Maineville, Ohio http://www.norbertrunning.com Please support an American Indian Elder & Medicine Man by visiting the above link. <><><><><><><><><><><><><><><><>