Apple released a minor bug fix for iTunes 11.2.1 tonight following yesterday’s release of iTunes 11.2 alongside OS X 10.9.3. The release notes echo yesterday’s updated features, but installing the update does indeed fix the hidden “/Users” folder many users were experiencing.
Apple has since shared the following explanation:
“Available for: Mac OS X v10.6.8 or later
Impact: A local user can compromise other local user accounts
Description: Upon each reboot, the permissions for the /Users and /Users/Shared directories would be set to world-writable, allowing modification of these directories. This issue was addressed with improved permission handling. For information on the general content of iTunes 11.2.1, see http://support.apple.com/kb/TS5434.”
I’ve tested tonight’s update on two machines with hidden Users folders and both became visible immediately after the update without requiring a reboot.