The WordPress.org team recently released version 3.9.1, a maintenance update that addresses several bugs discovered in the large 3.9 “Smith” update.
WordPress 3.9.1 is a maintenance update only. There are no security fixes in this update. It focuses on addressing 34 bugs from the 3.9 release, as well as improvements to customized widgets, the visual editor, audio/visual playlists, and “some adjustments to improve performance.”
For more information, you can read the official...