updated 10:45 am EDT, Sat May 17, 2014
Version 11.2.1 corrects accidentally hidden Users folder
On Friday, Apple updated its iTunes application for the second time in as many days, but this time it was to correct a bug apparently introduced in the previous update, which accompanied the release of OS X 10.9.3. The new iTunes 11.2.1 update has the same release notes as the previous version but in fact exists solely to correct an error that hid the "Users" folder, causing consternation among Mavericks upgraders.
While the contents of the Users folder were not affected by the issue, the folder was no longer visible to users who upgraded both iTunes and Mavericks itself in Thursday's set of updates. Initially thought to have been a Mavericks flaw, Friday's iTunes revision suggests that the problem was in fact caused by the iTunes update, which set the "flags" the OS users to determine which folders are visible to "hide" the Users folder accidentally. The 11.2.1 update corrects this without a restart, hinting that it resets the Unix "sudo chflags" command for that folder.
Advanced users had already worked around the issue by resetting the "nohidden" command in the Terminal application themselves, and a few helpful programmers offered compiled Applescripts that would temporarily (until the next restart or login) make the Users folder visible again. The 11.2.1 update fixes the issue, rendering those helper apps unneeded. The disappearing Users folder bug did not affect all users, but apparently happened to a large enough pool of customers that it warranted an immediate correction.
Normal operations of the computer were not affected by the glitch. The update for iTunes can be seen by checking Software Update, and is recommended for all OS X Mavericks users.