IMovie freezing at Thumbnails each time

Everytime I open up IMovie, it gets stuck at Generating Thumbnails and never gets done.  I've even left it alone for over 24 hours.  Even if I close it out and restart the computer, as soon as IMovie starts it goes to generating thumbnails and gets stuck.  What should I do?
Thanks
Annmarie

jay, I think I've worked this out but it's taken me a while.
I had the same problem in that each time I've attempted to open iMovie I was met with the 'generating thumbnails' message, every time, and a freeze for up to two hours. Bloody annoying!! So after trial and error here's what I did and iMovie has now opened for the first time in three days.
1. opened movies/iMovie/iMovieevents and iMovieprojects and removed all films to the desktop - I had about eight folders. Leave the folders but no films in there.
2. I then opened my library folder and opened preferences folder
3. I removed all 'com.apple.imovie.plist' files to the desktop - this didn't make much difference but do it anyway.
4. I then looked through the folder for missed files and found  a something called 'com.apple.iMovieApp.p.list.lockfile' and removed it to the desktop.
5. launched iMovie and it worked immediately! Voila!
I've spent a few hours editing and iMovie opening and closing no problem. I just checked that the films I removed to the desktop are all in the events library and they are and are working no problem.
Hope that helps!

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              com.NovatelWireless.driver.NovatelWirelessUSBCDCECMData (3.0.13) Support
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              com.novamedia.driver.IceraUSB_MSD_Bypass (1.3.0) Support
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              com.tomtom.driver.UsbEthernetGadget (1.0.0d1) Support
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              com.vodafone.driver (3.0.9) Support
              com.vodafone.driver.Data (3.0.9) Support
              com.vodafone.driver.DisableAutoInstall (2.0.6) Support
              com.zte.driver.cdc_ecm_qmi (1.0.26) Support
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              de.novamedia.driver.NMUSBCDCACMControl (3.2.12) Support
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              de.novamedia.oem.vodafone.vtp.huawei.cdc (0.0.2) Support
              net.kromtech.kext.AVKauth (2.3.6 - SDK 10.8) Support
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              de.novamedia.nmnetmgrd.plist Support
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              com.adobe.fpsaud.plist Support
              com.citrixonline.GoToMyPC.CommAgent.plist Support
              com.trusteer.rooks.rooksd.plist Support
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              com.zeobit.MacKeeper.AntiVirus.plist Support
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              com.conduit.loader.agent.plist Support
              com.epson.ews.launcher.plist Support
              com.hp.devicemonitor.plist Support
              com.hp.messagecenter.launcher.plist Support
              com.trusteer.rapport.rapportd.plist Support
              de.novamedia.VodafoneDeviceObserver.plist Support
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              com.adobe.ARM.[...].plist Support
              com.apple.CSConfigDotMacCert-[...]@me.com-SharedServices.Agent.plist
              com.google.keystone.agent.plist Support
              com.zeobit.MacKeeper.Helper.plist Support
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         Dropbox
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         FlashPlayer-10.6: Version: 14.0.0.145 - SDK 10.6 Support
         JavaAppletPlugin: Version: 13.9.8 - SDK 10.6 Check version
         AdobePDFViewerNPAPI: Version: 10.1.7 Support
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         AdobePDFViewer: Version: 10.1.7 Support
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         Flip4Mac WMV  Support
         GoToMyPC Preferences  Support
         Trusteer Endpoint Protection  Support
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    Regards
    John  (omegajon)

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