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 Release Latest OSX Lion 10.7.2 and iCloud for Mac to Developers
Apple said to expect iCloud in the fall and that time frame is fast approaching. We believe that Apple is in the final stages of development as recently Apple has released new builds of iCloud for Mac and OS X 10.7.2 to developers.
The new release of iCloud for Mac build is beta 7 while the new OS X build is version 11C37. Both the iCloud Mac and also 10.7.2 downloads are available to developers through the iCloud developer portal.
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