Motion 5.0.5 Update
Be sure you are on the LATEST VERSION of Snow Leopard, Lion, or Mountain Lion before updating to 10.0.6.
Verify that your third party plugins are 10.0.6 ready, as not all are.
Be sure to back up your events, projects, the update may not work with some plugins, yet.
Never update mid-project.
See this KB article from Apple.
http://support.apple.com/kb/HT5550
Review can be found here.
http://www.macprovideo.com/hub/review-2/review-final-cut-pro-x-1006-a-major-upda te