Apple has now released OS X 10.11.5 update, which is available through the App Store’s updates as usual.

Release notes are once again unhelpful, I am afraid. We are simply told that the update “improves the stability, compatibility, and security of your Mac, and is recommended for all users”, and offered three bugfixes for enterprise installations, covering configuration files and NetBoot images. Considering that the update is 907 MB in size, this is woefully uninformative.

Apple: please tell us a little more specifically what you claim to have fixed.

This update also includes many fixes for vulnerabilities, in OS X (listed here) and Safari, which is updated to 9.1.1. I note that among the fixes listed is one which could prevent Disk Utility from compressing and encrypting disk images, and multiple memory corruption issues, including several in the kernel. PHP is also updated to version 5.5.34.

With this comes iTunes 12.4, for which we are similarly left in the dark over any fixed bugs, such as the rare issue of database corruption and deletion of tracks.

iOS 9.3.2, watchOS 2.2.1, and tvOS 9.2.1 have also been released, so it looks like we have plenty of updating to be getting on with.

Further information:

I have now applied the 10.11.5 update here, and would warn you that it may have a problem. There are two restarts which occur during updating. After the second, and normal login, my logs filled with over 4000 error messages similar to the following:

16/05/2016 19:29:21.221 FileStatsAgent[631]: [19:29:21.221] <<>> FigFormatReaderCreateForStreamReturningMatchingContainerLabelType: *** Could not find format reader for URL "file:///Library/Application%20Support/Final%20Cut%20Studio/Motion/Library/Content.localized/Drawings.localized/Ornament%2006.mopr" path "/Library/Application Support/Final Cut Studio/Motion/Library/Content.localized/Drawings.localized/Ornament 06.mopr" extension "mopr" FileType '' MIMETYPE "(null)" SuggFileName "(null)" SuggNameExtension "(null)"

16/05/2016 19:29:21.221 FileStatsAgent[631]: [19:29:21.221] FigFormatReaderCreateForStreamReturningMatchingContainerLabelType signalled err=-12847 (kFigFormatReaderError_FileNotRecognized) (Unrecognized content) at /Library/Caches/com.apple.xbs/Sources/CoreMedia/CoreMedia-1731.15.204/Prototypes/FormatHandlers/FigFormatReader_Common.c line 2158

This does not look good, but does not seem to recur following the next restart, which seems to be relatively clean.

So my advice is that you might like to perform an additional restart once you have updated.

I will post further information as it becomes available.