Currently Being ModeratedFeb 19, 2013 10:34 PM (in response to d3bing)
There are a number of others here having the same problem (including me), where the project appears in Finder in the iMovie Projects folder but is not listed in the Project Library in iMovie. The project just seems to disappear from the Library.
Here is a link to a recent topic. It includes a post by me where I've provided links to other topics regarding this issue.
You've given an excellent summary of things you've tried. I've also tried most of those, but haven't as yet reinstalled iMovie. As I have Final Cut Pro X, I also attempted to open the project file in that app with no success. FCP X crashed just after loading, after I had selected from the menu - File > Import > iMovie Project.
You can submit feedback to Apple - from iMovie's Menu select iMovie > Provide iMovie Feedback.
Sorry I can't help you solve this.
JohnMacBook Pro (15-inch Late 2008), OS X Mountain Lion (10.8.2), Sony HDR-SR7 & DCR-TRV20E
Currently Being ModeratedApr 20, 2013 9:26 AM (in response to d3bing)
Help! This has just happened to me too! What is going on Apple??? We even have a copy on a memory stick but it still won't open in iMovie. If anyone has found a solution to this I would be very very grateful for the help I have a very upset teenager here who has lost her school project.
Currently Being ModeratedAug 21, 2013 12:48 AM (in response to d3bing)
Same problem here..
I have tried all of the above and also restored iMovie and the project folder to states prior to the malfunction using Time Machine and none of that worked.