I'm hoping someone has encountered this and can help me. Here is my timeline of events: Upgraded to Snow Leopard when it first came out Upgraded to 10.6.8 when it became available Upgraded from iMovie '09 to iMovie '11 by purchasing in App Store --> iMovie '11 worked correctly Upgraded to Lion --> iMovie '11 fails on startup with the error "Missing QuickTime Components" (see screenshot) I have tried: Removing and re-installing iMovie as suggested by the popup (this did not help) Re-installing /Library/QuickTime/AppleIntermediateCodec.component and /Library/QuickTime/AppleMPEG2Codec.component from the Lion distribution - as suggested in some other posts I found on this topic (this also did not help) Does anyone have any further suggestions? How do I find out exactly which component is missing? Spidey!!!