After Mavericks upgrade, iPhoto won't work. Attempting to update it to 9.5.1 from the app store fails with "the product distribution file could not be verified. It may be damaged or was not signed. This is the case for iMovie update as well.
All attempts to remedy have turned up unsuccessful and a deep Google search didn't amount to much.
I tried to find/delete the file in /var/folders (which has worked before) but the console does not show a folder to delete, instead it shows a different error (attached)
Any help is greatly appreciated here.