I apologize in advance for the long post but please read on if interested. My girlfriend purchased a Rev C MBA yesterday. Before we left I asked if we could open the box to make sure that there was no "line issue". The "salesman" said that he has never heard of a line issue and that we could just open it up at home and return it if there was an issue. I did not want to make a big deal about it so I agreed. After setting up her machine (transferring iTunes/Photos/Docs etc) I noticed that a line appeared when I would use expose. This would not happen every time but often. My first question is: Is this the line issue? I have read so much about it but never has it been described in detail (that I have seen, and I have searched). Moving on...she decided to take it in today (without me). She spoke with another salesman about the issue. He explained that this line "is beveled so it is supposed to be there," and that "its a function of Snow Leopard to show when things are minimized " despite admitting that this is the first time he saw this. Can someone please confirm that this is not a feature! Maybe I am crazy but I do not see how this could be a proper function. It does not happen every time and it makes no sense. He has also never seen this but sold it as a feature. Is the common line issue a screen issue or a software bug? I am confused and disappointed with the service she received. Thanks, Josh PS - If this is a feature, can I return my Rev A bc it does not have this "function"??????? Just Kidding!