Decaf v1.6 stable is now availble for download from the Plugins database. This version fixes several issues, adds compatibilty with newer versions of Moodle and the $CFG->themedir setting and improves usability and performance. A brief list of changes follows, for those who want more detail.
Changes since 1.6 RC6:
* Added support for $CFG->themedir
* Added 2.4dev compatibility
* Fix for edit buttons not appearing until page refreshed on activities/resources created by dropping files in
* Performance improvements (particularly if "Show all courses" option is enabled in Navigation settings)
Other changes since 1.5.1:
* Performance improvements (large reduction in the number of database queries being performed)
* Complete rewrite of Awesomebar styles
* Improvements to custom menu appearance, to match Awesomebar more closely
* Awesomebar now lingers for 500ms when the mouse moves off it
* Awesomebar now shifts long/low submenus up so they don't run off the bottom of the screen
* "Back to Top" arrow now present on front page
* Page layouts brought closer in line with standard and tidied up
* Don't show hidden nav/settings block stubs if Decaf is set to hide the applicable block
* Fix position and visibility of edit icons / edit buttons within block contents (i.e. menu block)
* Fix for modules sitting on top of Moodle 2.3 activity chooser
* Fix for deprecation warning when logging in as a non-admin user (if debug output is enabled)
* Fixes for other minor issues
* Moodle 2.3 compatibility