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
New Lets Fly Application Designed By Mathew Martino
The lets fly app contains vital information for aviation enthusiasts and PPL students and is based on the books by Matthew Martino
Lets Fly takes you on a journey from the ancient era of flying to the dream that is reality while giving you the information on things such as the different types of altitude, magnetic compass, airspeed, flight schools and the Pilot CV Feature.
Another great feature from Lets Fly is its ability to teach you the phonetic alphabet which can be a very tricky thing to learn for the first time pilot.
It features the ability to teach you certain factors about exams and your whole journey towards becoming a fully trained pilot or a part time pilot is helped along by Matthew Martino who is a Zimbabwean English actor, author and film producer.
Martino did cameo appearances in About Time and Dom Hemingway. And produces independents films such as Jericho, Never Change, and The Mind Game, among others. His directorial debut, Lets Fly Documentary was released in 2013.
Lets Fly can be downloaded from the App Store by clicking here and the app will run on iPhone, iPad, and iPod touch and will requires iOS 4.3 or later while having over 25 reviews so far on the app store.