Reprinted from TidBITS by permission; reuse governed by Creative Commons
license BY-NC-ND 3.0. TidBITS has offered years of thoughtful commentary
on Apple and Internet topics. For free email subscriptions and access to the
entire TidBITS archive, visit http://www.tidbits.com/


   OS X 10.11.3 and iOS 9.2.1 Bring Bug Fixes

   Adam C. Engst

   Apple has released OS X El Capitan 10.11.3 and iOS 9.2.1. The release
   notes on both updates border on the nonexistent. For 10.11.3 in the App
   Store app, Apple says:

     This update contains bug fixes and security updates.

   The [1]support document referenced for additional details gives only
   two specific changes, the second of which is likely of interest mostly
   to enterprise users.

     Fixes an issue that may prevent some Mac computers from waking from
     sleep when connected to certain 4K displays. Third-party .pkg file
     receipts stored in /var/db/receipts are now retained when upgrading
     from OS X Yosemite.

   For iOS 9.2.1, Apple says:

     This update contains security updates and bug fixes including a fix
     for an issue that could prevent the completion of app installation
     when using an MDM server.

   Again, that's mostly relevant for enterprise users.

   The updates also address a handful of security vulnerabilities: [2]nine
   in 10.11.3 and [3]nine in iOS 9.2.1. As a reminder of how much code is
   shared between OS X and iOS, five of the nine vulnerabilities were the
   same on both operating systems.

   You can install the OS X 10.11.3 update (661 MB on an iMac with 5K
   Retina display) via Software Update (it's not yet available from
   Apple's Support Downloads page) and the iOS 9.2.1 update (37.7 MB on an
   iPhone 6) via Settings > General > Software Update, or through iTunes.

   We recommend waiting for a while with these updates unless the
   enterprise-related fixes are essential for your organization. When Adam
   updated to 10.11.3, his iMac hung at a black screen with a Restarting
   progress bar two-thirds filled. It came back up ' fully updated '
   properly after he powered it down, but on the off chance that his
   experience is indicative of a more general problem, delay the update
   for a bit. And when you do decide to update, make sure to make a backup
   first.

References

   1. https://support.apple.com/en-us/HT205356
   2. https://support.apple.com/en-us/HT205731
   3. https://support.apple.com/en-us/HT205732

.