On Dec. 6 2017 Apple launched a update for all the devices Mac / MacBook, compatible with macOS High Sierra. This update it does not bring visible changes for users, but it solves some functionality problems. In addition, there are security changes / patches, about which Apple but it does not offer too many details.
Stability and compatibility updates brought in macOS High Sierra 10.13.2
- improves the compatibility of audio devices connected by USB
- Improves navigation with VoiceOver in PDF files opened with the Preview application
- Improves Braille and Mail compatibility. (application that allows blind people to use the Braille alphabet pe Mac)
This update de macOS is recommended for running devices macOS High Sierra 10.13.1. For all other systems with macOS Hight Sierra, installation is recommended macOS High Sierra 10.13.2.
Along with this update system, and one was launched for iTunes. versions iTunes 12.7.2 brings minor changes that we don't know much about.
Updateis available via App Store → Updates and requires system restart.