Edit: After half day, my wife’s Mac started having the same problem. I have then applied the solution that I found in the Apple
Instagram Direct Announced Bringing Private Photo & Text Messaging To Instagram
At the current media event which Instagram is still currently holding they have just announced a new feature for Instagram now known as Instagram Direct.
Instagram Direct allows you to share photos privately between 1-15 people. You will only receive messages from people you follow and if anyone tries to send you a message who you don’t follow then you will get a request asking if you want to see the message or now.
From how you capture photos and videos to the way you start conversations through likes and comments, we built Instagram Direct to feel natural to the Instagram experience you already know. When you open Instagram, you’ll now see a new icon in the top right corner of your home feed. Tap it to open your inbox where you’ll see photos and videos that people have sent to you. To send a photo or video to specific people, tap the camera button to enter the same simple photo or video capture and editing screens. At the top of the share screen, you’ll see the option to share with your followers (“Followers”) or to send to specific people (“Direct”). To send using Direct, tap the names of the people you want to send your photo or video to, write your caption, tap “send” and you’re done.
After sending, you’ll be able to find out who’s seen your photo or video, see who’s liked it and watch your recipients commenting in real time as the conversation unfolds.
Instagram for iOS version 5.0 is available today for download in Apple’s App Store, and Instagram for Android version 5.0 is available today on Google Play. Instagram for Windows Phone is in beta. Stay tuned for future updates.
Apple’s App Store