Hi Barbara What you say is absolutely correct Regarding interference You reminded me I had that same problem with a crt monitor that was close to the mouse (as it was so big it had to be at an angle) That was a few years ago and took a while to fathom out as well, I had quite forgotten that problem It doesn't solve my problem now but its certainly worth taking into account Nivard Ovington in Cornwall (UK) On 17/11/2013 16:48, Barbara wrote: > If you have 2 wireless mice in close proximity they may be causing the > problem. > Shut off one of them if there is no shut off switch remove the battery of > one and see if it corrects the problem