Hi, I have a very annoying problem, since installing AutoCAD 2011, full version, my mouse gets very jerky - just like the snap is stuck on. It is worse in model space and is not consistant. Some days are really bad, others are fine, it does not target certain drawings either - it just has a mind of its own. It is frustrating and time consumming, it takes forever to pick anything. We have 10 computers in the office, all have the same operating systems - only 3 are affected!
 
Any ideas? My drawings are purged and audited regularly, I am out of ideas - I am not a Newbie either, I have 15 years experience - PLEASE HELP (my pc is in danger of flying)

Could be your video card. What card do you have installed in the 3 stations that are having problems. And while we're at it, what are the full system specs of the 3 affected computers.