There has been much discussion, many attempted remedies, but no solutions to this problem. Here is the solution, and it's very simple. See:
<http://support.apple.com/kb/HT1379?viewlocale=en_US>
It takes less than a minute, and it works.
<http://support.apple.com/kb/HT1379?viewlocale=en_US>
It takes less than a minute, and it works.