The MacBook Air and MacBook Pro Update 2.0 was offered for 2012 models. However, there continue to be reports of issues with the update. Worse, late last week, Apple pulled the support page about the update as well as the download link. Recall time.
Some users report issues with video memory as well as with Keychain operation.
On the VMware Fusion Blog, a post warned that the update may cause virtual machines to stop working when a 3D application is run.
Users who have already applied this update and are affected by this issue can work-around it by disabling the “Accelerate 3D Graphics” option under Virtual Machine > Settings > Display.
Meanwhile, Apple this week released a new update for Mountain Lion, OS X Mountain Lion 10.8.2 Supplemental Update 2.0, which may address some of the Keychain issues separately.
This update is recommended for all Mac systems introduced in 2012.
So, it appears to be a problem with Mountain Lion and not the laptops.