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
iPad 2 and iPhone 4s (A5 Devices) Jailbreak Coming Next Week –
pod2g is still hard at work and minutes ago tweeted saying he has made a huge step toward the jailbreak for the iPad 2 and iPhone 4s. A lot of people have been waiting for this for so long. pod2g then went on to say that we may see the jailbreak released in about a week.
UPDATE : pod2g has just confirmed that you should upgrade you iPhone 4s and iPad 2’s to iOS 5.0.1 ready for the jailbreak