IMovie quit's unexpectedly since upgrade to 10.10

Question

Since upgrading to OSX 10.10 from Mavericks, on a late 2012 Mac Mini (2.3 GHz i7, 4GB Ram) iMovie will now quit unexpectedly on every load after a few seconds.
It appears to be attempting to convert my iMovie Library but this process never completes and crashes before completion. The progress bar shows "Loading event ..." before unexpectedly exiting. iMovie is now unusable and (I fear) has wrecked my iMovie Library.
I have tried without success...
- Rebooting
- Moving my iMovie library so iMovie can't find it and has to load without attempting to open the library (it finds it anyway)
- Deleting ~/Libary/Containers/com.apple.iMovieApp folder which makes no difference (it was advised elsewhere)
- Lamenting my choice to upgrade
Any assistance offered would be greatly appreciated.
The report log shows:
Process:               iMovie [709]
Path:                  /Applications/iMovie.app/Contents/MacOS/iMovie
Identifier:            com.apple.iMovieApp
Version:               10.0.6 (252905)
Build Info:            iMovieX-25290005040000000~1
App Item ID:           408981434
App External ID:       715442672
Code Type:             X86-64 (Native)
Parent Process:        ??? [1]
Responsible:           iMovie [709]
User ID:               501
Date/Time:             2014-10-17 19:15:31.882 +0100
OS Version:            Mac OS X 10.10 (14A389)
Report Version:        11
Anonymous UUID:        8E2779D4-E6F7-55F3-F092-F020FAE846EC
Time Awake Since Boot: 4300 seconds
Crashed Thread:        0  Dispatch queue: com.apple.main-thread
Exception Type:        EXC_CRASH (SIGABRT)
Exception Codes:       0x0000000000000000, 0x0000000000000000
Application Specific Information:
*** -[__NSPlaceholderArray initWithObjects:count:]: attempt to insert nil object from objects[0]
abort() called

Answer 1

Overwhelmed by responses to my question; I have actually discovered the solution. There are essentially a few fixes for 'iMovie Unexpectedly Quit' which I will detail here that may resolve a number of issues. For this specific problem the solution was FIX3. You may wish to use combinations of or all of the suggested actions taken. It's your responsibility to ensure you backup your files before modifying or deleting them.
FIX1: Delete the iMovie cache found in ~/Library/Containers/...
Highlight the following text: ~/Library/Containers/com.apple.iMovieApp
Right click the highlighted text and at the bottom of that dialog select Services > Reveal in Finder
This will open the folder; copy this folder to your desktop or another location
Go back to the finder window you copied the files from and delete* this folder (move to trash)
Open iMovie
*[WARNING: Make sure you followed step 3. or iMove may not work]
FIX2: Delete the iMovie preference file com.apple.iMovieApp.plist
Highlight the following text: /Library/Quicktime/com.apple.iMovieApp.plist
Right click the highlighted text and at the bottom of that dialog select Services > Reveal in Finder
This will open the folder with the file you need selected; copy the .plist file to your desktop or another location
Go back to the finder window you copied the files from and delete com.apple.iMovieApp.plist.
Open iMovie
*[WARNING: Make sure you followed step 3. or iMove may not work]
FIX3: Remove third party components from /Library/Quicktime/
Highlight the following text: /Library/Quicktime/
Right click the highlighted text and at the bottom of that dialog select Services > Reveal in Finder
This will open the folder; copy all the files to your desktop or another location
Go back to the finder window you copied the files from and delete everything except AppleIntermediateCodec.component and AppleMPEG2Codec.component which are required by iMovie.
Open iMovie
Optional: You can then trial and error return copied components to establish what is causing the problem.
*[WARNING: Make sure you followed step 3. or iMove may not work]