updated 03:48 pm EDT, Tue June 12, 2012
May render some Macs temporarily unusable
Some people are experiencing serious errors with Thunderbolt Software Update 1.2, released yesterday, according to reports. Affected users will see any number of issues when booting a Mac, ranging from "unexpected error" messages to kernel panics or becoming stuck at the gray boot screen. The only solution so far is believed to be reinstalling OS X Lion, or simply avoiding installing the update in the place.
The patch adds support for the Thunderbolt-to-Gigabit Ethernet adapter, and is not essential for most Mac owners. The adapter is in fact only really meant for Thunderbolt-equipped MacBook Pros and MacBook Airs, rather than the iMac or the Mac mini.