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Thunderbolt Update 1.2 for Mac causing boot-up problems (updated)  
Tuesday, June 12, 2012 | by Rob Galbraith
Among Apple's flurry of software releases yesterday was Thunderbolt Update 1.2, an update of Mac OS X 10.7.4 that adds support for the Thunderbolt to Gigabit Ethernet Adapter (shown at right). Though this accessory is stated to be compatible with the new MacBook Pro with Retina Display and Thunderbolt-equipped MacBook Airs only, the updater has popped up within Software Update on other Mac models as well, including site co-editor Mike's Sturk's MacBook Pro 15-inch.

Installing the software has brought his computer to its knees; he is, as of now, attempting to reinstall OS X in the hopes that will enable the laptop to boot up successfully again. A little Googling reveals that many, many other Mac owners have been stricken with the same thing.

If you've not yet installed the update, the prudent move would be to hold off. Though it did go into my MacBook Air 11-inch just fine, the reports of problems being experienced by others - including our own Mike Sturk - are too widespread to gamble installing it on any Mac with a Thunderbolt port right now.

Tidbits, an excellent Mac information site, has published a description of the steps to be taken if you've installed Thunderbolt Update 1.2 and are facing a machine that will no longer boot properly or at all. Their article includes links to some helpful threads within the Apple Support Communities discussion board too.

Update, June 14, 2012: Apple has now pulled Thunderbolt Update 1.2 from their website, suggesting that the problem is being looked into.

Update, June 19, 2012: Apple has just issued Thunderbolt Software Update 1.2.1,  revised version of the updater. The list of hardware that's compatible with the Thunderbolt to Gigabit Ethernet Adapter has also been expanded to include all Macs with Thunderbolt ports (running OS X 10.7.4 or later).
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