I am currently using 3 Macís which are iMac, an Air, and a MBP. Among this 3 Macís iMac and the Air works perfectly. Now when I want to buy an application I get it from app store and it works great on iMac and on the Air. But when I try to do this on the MBP no applications from the purchased list gets installed. When I try to install anything it constantly asks for billing information and asks me to enter a password even though I am already logged in. Installed applications are listed in the store but they donít get installed. If I try download a new application it goes through the same routine as listed above. Please help me out on this issue.