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
Apple roll Out IOS 4.3.5 –
Apple has just released their latest update to iOS (4.3.5) in iTunes , following their release of iOS 4.3.4 less than two weeks ago. The firmware update is available immediately, and fixes a security issue with certificate validation. The build number of the new update is 8li.