Users of new MacBook Pro notebooks also received a fix Apple said would "improve graphics stability and external display compatibility" in the laptops, Apple's first to boast processors from Intel's new Sandy Bridge line.
Apple's support forum has been flooded with complaints that the new MacBook Pros lock up when stressed by graphics processing chores.
Mac OS X 10.6.7 and the separate 2011-001 security update for Leopard can be downloaded at the Apple site or installed using the operating system's integrated update service.
The update downloads weigh in between 241MB and 475MB for the client versions of Snow Leopard and Leopard.
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