Problem sharing via email in Photos app on Mac As of yesterday, I can't send a photo from Photos app on my Mac via email (through the 'share' feature). I've been sharing this way all week and now, nothing. No message, it just doesn't do anything. Help?
For me, (with the same problem), the issue was that Apple Mail was not the default mail client (Thunderbird was).

Mail > Preferences > General 

Changed "default email reader" to Mail.app and Presto!  email appeared in the share menu.