Hello, I have been a pc user my entire life and last month decided to purchase an iMac. I am COMPLETELY satisfied and will never purchase another pc again. The only problem that my wife and I encounter is for example we are on a web page usually filling out a form and if the mouse is moved a certain way the screen shifts to the right and disappears!! What causes this and more importantly how can we stop it from occurring. It gets frustrating after spending a great deal of time entering information only to have the screen disappear??? Please help.