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 driver and quicktime 7.7 updates
Apple have just issued QuickTime 7.7 for Windows and Mac OS X Leopard and also a batch of driver updates for printers and scanners from Samsung, HP and Brother.
7.7 for Leopard
The update is a 68.85MB download and is recommended for all Mac OS X Leopard users.
7.7 for Windows
Users are warned that installing QuickTime 7 will disable QuickTime Pro functionality on prior versions of the software, such as QuickTime 6.
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