I am using LR 6.2 (stand alone) under Windows 7 with a Dell ST2420L monitor using an AMD Radeon 6450 graphics card. Yesterday, I received an update for the driver from AMD, which I installed. I now have an issue with the develop module not responding with some photographs. I have searched the forums and unchecked the "show message" option in the View menu. I tried to uncheck the Use Graphics Acceleration in Preferences, but that causes the program to not respond. This sounds like an issue with my graphics driver. How do I get the old version back? Any other suggestions would be welcomed!!!