I am writing this post in case other people encountered the same problem launching OmniFocus this morning that I had. I am including the procedure that fixed things for me.
After rebooting my Mac this morning, I was unable to launch OmniFocus 2 (Mac App Store version). It would instantly crash. Other Mac App Store apps were the same. The problem seemed similar to the Mac App Store signing bug from late last year. Other users on the Apple Support Communities reported similar issues ( https://discussions.apple.com/thread/7476111 ). This post ( https://discussions.apple.com/thread/3175514 ) fixed it for me.
- Delete the file Macintosh HD/Library/Preferences/SystemConfiguration/NetworkInterfaces.plist
- Restart OSX
- Try logging into Mac App Store again
I hope this helps anyone who has come to the forum after having encountered this problem.