Oct 25, 26 or 27 both Adobe Acrobat and Mozilla Firefox alerted me they had updates to install. Since I trust them both I installed them. However, since then my optical marble mouse from Logitech acted strangely different. The cursor did not move as usual. It didn't respond right. I thought it might have needed the dust wiped out, so I did that. It still acted sluggish when I tried to move it, it was as though it was "spinning its wheels" not going anywhere. I went to the Control Panel clicked on Mouse, and proceeded to look at the settings and set them to default. I then tried to use the universal scroll by clicking the two big buttons which showed a circle with cross hair arrows as usual. When the marble was moved forward or backward, the scroll had always been smooth allowing one to read the screen evenly and without holding any button down. Now it was jerky. Is this a problem from the last update? My version of Firefox is 3.6.12 Thank you