Apple has recently come with an update for Thunderbolt software for fixing bugs that caused boot-related problems to multiple Mac users.

The new update, 1.2.1 comes with support for the Apple Thunderbolt to Gigabit Ethernet adapter. One needs 520 KB space and OS X Lion 10.7.4 or later for coping with the Mac. Various posts on Apple’s Support Communities website highlight the fact that the previous update has caused frozen at the gray boot screen with the apple logo and swirly circle.

* I’m on an early 2011 MBP running Lion with all the latest patches/software except for the Thunderbolt update. The laptop has an SSD with whole disk encryption enabled.
I installed the patch, came back a few minutes later, there was an error saying it wasn’t able to apply it.. And the machine was frozen at that point, nothing else to do. I hard rebooted, and it’s in this frozen state since. Safe boot does not boot.

* Same thing here, after applying it is displaying the same screen on my early MacBook pro 2011.

A remedy for the bug consisted in a reapplication of the combo updater, being able to restore from a backup or even better from a reinstall of OS X. It seems that only OS 10.7.4 Lion users have come across the issue.

The new software has the proper features for coping with the new MacBook Pro with Retina Display.