While editing in Lightroom 3 (develop module) I had a computer glitch. After rebooting the photos failed to populate. I have one visible photo and the rest are the grey squares. Is there a chance that something just needs to be toggled on or off to make them visible? The # of photos shows correctly and I attempted to re-import (excluding duplicates) and nothing imported (as they are all there). How do I get the photos visible? All other libraries populate correctly except for this one.