My catalog became corrupt and I was unable to save 4 hours of edits. I was in the slideshow module and lightroom completely froze on me. I have a brand new iMac 10.7 so I'm pretty sure it is a glitch within lightroom 4. I've never had anything like this happen until I switched to 4. Lightroom was completely unresponsive and I had to force quit the application. When I went back into lightroom 4 it was still unresponsive and tried to shutdown my computer and I was not able to do so for hours. I finally unplugged my computer and lost all edits that had been made.
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