When ever I use the magnetic lasso or use either the clone stamp or the healing brush, the tool responds to a random, errant starting point somewhere on the other side of the pallette. The issue is that it creates an error in the starting point for any of these tools, causing a streak or line across the image that I have no control over. It stops the process, I have to back up to erase it, and forces me to begin again. Most often it occurs again and again, slowing work and causing problems with the image that are totally unintended. I am using CS4, but the problem has become such that I just reinstalled CS3 to continue working. What is wrong with this CS4? Is there a patch that can fix it or am I stuck with an expensive dud?