Q: Aperture Cannot Open...3.4.3

Do you see in your crash log an error message like this:

Dyld Error Message:

  Library not loaded: /Library/Frameworks/PluginManager.framework/Versions/B/PluginManager

  Referenced from: /Applications/Aperture.app/Contents/MacOS/Aperture

  Reason: no suitable image found.

 

Then your recent Final Cut installation probably caused this.

(Aperture 3.x: Aperture unexpectedly quits if Final Cut Express 4 is installed).

You need to restore the PluginManager.framework to the System Library, either from your TimeMachine Backup or by reinstalling Mt. Lion.

To reinstall proceed like described here:

Re: Garageband doesn't open in Mac Mini mid 2011

Regards

Léonie

Yes, backing up before reinstalling is essential.