I've come here as a last resort as I am at wits end. Last night I was using lr4.2 without an issue and now this morning it is not working at all. I can see the files perfectly under the library tab but when I switch to develop to process the images everything goes to hell. The images appear blurry as if a preview has never been made. When I try zooming in, the image just becomes more blurry. This is happening on all of my files from the past 3 years so it isn't a recent image issue. So far I have tried restarting the computer (windows based, vista 64 professional) and creating a new catalog.
Has anyone experienced this before?