Suddenly my event library in iMovie 11 is empty.  I have tried deleting the plist, importing clips from multiple locations (to see if they show up in the library), re-installing iMovie, and re-installing Mountain Lion. Help??

Suddenly my event library in iMovie 11 is empty.  I have tried deleting the plist, importing clips from multiple locations (to see if they show up in the library), re-installing iMovie, and re-installing Mountain Lion.
I was working on a project, when all of a sudden the event library went blank.  There are no devices showing in the left column, only "last import" and "aperture videos".  There are no video clips in the editing window.  I have "Show: All Clips" selected.  I've tried "group events by disk". 
When I have a Project open, it plays just fine.  There are no yellow triangles saying "source clip is missing".  Yet, again...nothing is in the event library large editing window.  So, it seems the data is still there, but invisible.  This is true with all the projects, and all the external devices I've experimented by plugging in to see if their video clips show up in the event library. 
I have tried to import new movies, and iMovie responds as normal...looking like it's importing, then "generating thumbnails", then it makes the "ding" signalling that the import is complete...but nothing shows in the event library.  I've tried importing movies from the harddrive, from quicktime, and from an external drive.
I have searched the forums, and found many users with a similar, but not the same, problem.  For them, it seems the "go to users-library-preferences and delete iMovie plist" has solved their problem.  This didn't work for me. 
I uninstalled/reinstalled iMovie, I even have re-installed Mountain Lion (from a last-ditch effort suggestion from Apple technician). 
HERE'S AN INTERESTING DETAIL:  After almost 5 hours on the phone with Apple, I decided to cut my losses and take my project to another Mac I have.  I'm working on a project, for work, that is critical that it's completed by tonight (whoops), and all my video is on an external drive.  So, I plug in the external drive to Mac #2, open iMovie, and everything is looking fine.  I continue importing some files I was converting, through Wondershare, and suddenly (whether or not this has to do with the importing, I'm not sure), the SAME THING happened to Mac #2!!!!  I can't believe this. 
Does anyone have any suggestions?  Have you ever heard of this happening?  Could it have to do with the files I'm importing??? 
I apologize if my language is confusing.  Obviously, I'm not an Apple genius-person!  I hope I've provided all the information you need.
Mac #1 is a 27" desktop, mid-2012, software up-to-date.  Mac #2 is a 24" desktop, about 4 years old, OSX 10.7.5

I'm adding more information:
in Finder, my iMovie folders are all visible and accessible.  When I click on a clip from iMovie Events folder, Quicktime opens and plays the clip.  ALL my video is not missing - it just isn't showing up in the Event Library!
This happened all of a sudden, while I was working on iMovie project (on both computers).
All my Projects are intact, and play when I open them. 

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