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 OS X Lion 10.7.3 To Developers –
Apple has just released OS X Lion 10.7.3 (11D16) to developers earlier today . This update aims to improve iCloud document storage, Address Book, iCal, and Mail. 10.7.3 can be downloaded at 633MB and has no reported bugs or glitches , OS X 10.7.3 Server was also released to developers. Release Notes Belows
OS X Lion 10.7.3 build 11D16 Seed Note
OS X Lion Update 10.7.3 is an update to OS X Lion 10.7.
The OS X Lion 10.7.3 Update (Combo) updates
– OS X Lion 10.7, 10.7.1 or 10.7.2 GM builds.
The OS X Lion 10.7.3 Update (Delta) updates
– OS X Lion 10.7.2 GM builds.
Please be aware that you will not be able to revert back to your previous system after updating. Please install this update on a system you are prepared to erase if necessary.
– iCloud document storage
This build is being provided to you for testing and development purposes. Should you encounter any problems, please submit a bug report using the online Bug Reporter at <http://bugreporter.apple.com/>. Please make sure to include “10.7.3 (11D16)” in the bug title and description. This information will ensure that your bug is processed quickly.
When submitting a bug report, please make sure to include a Summary, Steps to Reproduce, Actual Results, Expected Results, the System Profile Report, and any other relevant information that is necessary to process the report.
IMPORTANT: Engineering requires additional information for crashing bugs, kernel panics, and hanging issues.
Crashing Bugs: Crash logs are required for crashing bugs. Crash logs can be located in ~/Library/Logs/DiagnosticReports
Kernel Panics: Backtraces, which contain vital information for investigating kernel panics, are required for kernel panic issues. Backtraces can be saved to nvram on restart shutdown, then copied to the panic.log file on restart. The panic.log file can be found in /Library/Logs/PanicReporter.
Hanging Issues: When an application is hung, a Sample should be provided. This can be done using the Activity Monitor (/Applications/Utilities/). To generate a Sample using this utility, click on the hung application name, then from the View Menu select “Sample Process”.