Released 28 Jul 2016. Build number is 216.
See 6.6.5 Help's Release Notes for more detail of minor points. This release also includes a number of minor error fixes and under-the-hood improvements for overall performance/stability.
This maintenance release version had fixes for Escape key to cancel note creation in outline view, correcting handling of the Note menu Create note option in outline view. There were also fixes to the app's Help file.