OK i have been running LR4 fine and upgraded when needed. I'm currently on 4.4 and all has been well until now. When viewing images they don't look sharp! Before when clicking on a thumbnail the image would pop up all fuzzy then get sharp real quick....always has done. This also happens when zooming in to the image, it just looks fuzzy, it does not click into a sharp image to work on, the images come up but don't get sharp. Also there is not always a thumbnail in the top left above the presets. Also if you add a preset the image just disappears!! I have deleted and re-installed the program but to no avail. Any ideas?