Just upgraded my 2011 iMac (i7, AMD Radeon HD 6970M) to OS X Lion. Before this the system was running with Snow L. Now the problem is the Finder display does not seems to be clear. While scroll in the Finder windows I donít see the proper way of scrolling except it lags and looks like screen cuts in between each line. I donít know whether this issue is about the OS X Lion or Display monitor. Can anyone tell me whats wrong with this thing?