Hi guys, The hard drive in my iMac just crashed last weekend. No big deal, thats what Time Machine and AppleCare are for. So after a trip to the genius bar, I restored from my Time Machine backup. Everything seemed to be going great until I tried opening Aperture for the first time. That was when I got the error: "There was an error opening the database for the library." I let Aperture manage the files, not reference. The entire library is there, including all masters and even versions (with previews). It appears to be a problem with just the database. Using MRoogle. I found this thread from a while back. I have tried all of the suggestions but rebuilding the database (more on that later) and nothing has worked yet. When I remove the plist file, Aperture opens up fine and starts a new library. I then tried to switch to the old one. It pulls up a progress bar saying "Upgrading library: Scanning library" but never does anything. I let it sit like this all day while I was at work and when I got home, it was still just sitting there. OK, now back to rebuilding the database. It let me do the command-control-click thing once or twice, but now I cannot get it to open that pane when it is set to open the old library. Oddly enough, when I remove the plist so that it tries starting a new library I can get to it every time. One other note, just in case it may have something to do with it: When the hdd died, i was on Aperture 3.1.2. While it was down, 3.1.3 came out. when I restored it, the first thing I did was run Software Update, which then updated Aperture. I never tried opening the library in between. OK, so finally, does anyone have any idea what I can do to get my library back? If it's beyond all hope, so be it. All of my masters are there and I can always just import them into a new library. One last question: what should I be doing to prevent such a problem in the future? Thanks in advance for any help.