Q: Aperture not working after update.

I would try uninstalling and re-installing Aperture.

http://support.apple.com/kb/DL1588

I am having the same issue here, and uninstalling and re-installing does not help.  It seems to be looking for some libraries but cannot find them.  Since this installing is coming from the App store, my guess it the installer is buggered, so re-installing is not going to fix the issue.  Hopefully this does not corrupt the library.

If you are connected to timemachine you might be able to back to before you upgraded.

Robert, what is the crash log say? When you retried to install from the app store, did you first trash and delete ALL copies on all local drives?

This solved the problem for me:  Go to user/library/Preferences and delete "com.apple.Aperture.plist"...then reopen Aperture...

there is no file called ''com.apple.Aperture.plist''

ImranSe – I'd try deleting Aperture from your /Applications folder and reinstalling from your original discs (or from the App Store), rather than trying to delete the .plist file. The .plist fix looks like it's a temporary one.

I'm still having the problem. I don't have a .plist file and I don't want to delete the program cause i have lots of pics that i don't want to lose. Any other ideas?

Talked to Apple support. Did several things. First using disk utility, repaired permissions.  Then, went inot the system library an trashed a permission file, e.g. com.apple.aperture.plist?  Not the locked file. After doing this, all is well again.  The program needed to repair some Aperture library files, but it opened and is functioning as usual.

PS I had the same concern re deleting the application with 6,000+ photos in it.

Deleting the .plist file will not cause you to delete the program or any images.

Make sure you are looking for the .plist in your user library folder and not the system library folder...by default, the OS hides your user library folder from view...there are lots of ways to "unhide" it, but my preference is to do this:  http://osxdaily.com/2011/07/04/show-library-directory-in-mac-os-x-lion/

This will unhide it permanently so that the next time there is some kind of problem you will be able to easily delete the offending preferences file.

Once you have done this, you can now go to ~/Library/Preferences/ and locate the com.apple.Aperture.plist file and delete it (where ~ represents your home folder, whatever you call it).

If this does not solve your problem, you can reinstall the application, which takes a lot more time.

Try what I suggest here:

Re: Aperture 3.4 crashes on startup how do I downgrade?

Thanks all sorted good advice

This worked for me too!  Thanks a million.. Huge library - I was very scared....

I deleted com.apple.Aperture.plist but Aperture is still not opening.

I receive this error:

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.  Did find:

          /Library/Frameworks/PluginManager.framework/Versions/B/PluginManager: no matching architecture in universal wrapper

          /Library/Frameworks/PluginManager.framework/Versions/B/PluginManager: no matching architecture in universal wrapper

Anybody knows a solution?