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
150 Student Scholarships Available For WWDC 2013
Apple is once again offering 150 spaces for student scholarships to go to WWDC 2013 which was announced earlier today.
The scholarship offers student developers then opportunity the chance to attend the conference free of charge but it is still down to you to pay for travel and to find a hotel.
First step is to check you meet the eligibility requirements which can be found here, the next step which is create an app to highlight development projects you’ve worked on, your educational and professional background, technical skills, and interests this maybe tricky for some to complete by the submission date which is May 2, 2013 at 5 p.m. PDT.