A maintenance release of ardour, 2.8.12, has been released.  According to the announcement, this version fixes the following bugs:

Crash Fixes

    * Fix crash when two overlapped regions are selected
    * Fixes crashes when playhead is moved if fader automation is on the 'write' setting
    * Symptom-fix for an issue with bogus crossfades. Avoids crashes though it doesn't fix the underlying problem. 

Bug Fixes

    * Fix misbehaviour when freewheeling due to Ardour's own export
    * Change the way we use "physical screen height" to better account for multi-monitor setups
    * Make sequence-files option for import use file timecode, make all import/embed ops use per-file TC if timecode was requested, rather than just the first file's TC
    * Fix occasional deafening noise at region cut points
    * Fix management of fade in/out active management
    * Restore text to the editor canvas on big-endian machines (OS X PPC)
    * Don't try to call "render" on AU plugins with no input elements
    * Some Mackie-emulation systems (e.g. euphonix) send zero for the tick count when the jog wheel is moved, so accomodate this by pretending that they reported 1 tick
    * Save/restore environment as needed when forking external apps like JACK
    * Fix possible drift out of sync of tracks during varispeed
    * Don't adjust session end location when any region end is moved.
    * LV2 UI parameter now handled by the GUI thread, not just the same thread that the update happened
    * Prevent ardour from ever, EVER, EVAH removing an existing source file
    * Make sure declicking fades reach their target
    * Fix Insert Region From List and Fill Range with Selected Region
    * Add support for AudioUnit parameter listening
    * Make timefx thread sleep for a bit after its done, so that the GUI can process its requests before it dies and takes it request buffer with it
    * Fix old issue where copy-pasting a range selection from region(s), each region would inherit the parents full fade-in or -out even when the region excerpt didnt include the fade
    * Fixes for gcc 4.6
    * Do not try to silence port buffers after a reconnect, since this violates old JACK policy and new JACK implementation
    * Fix reallocation of silent, passthru and send buffers, specifically after a reconnect to JACK
    * Fix cut-n-paste typo that caused Session::send_buffers to be the wrong size
    * Commit patch from colinf to just err, rather than abort, if ::truncate_start() is called on an empty automation list
    * Fixed bug where embedded sources did not correctly obey the BWF time stamp and would import at the timestamp of the first file
    * When importing sources that are using sample rate conversion, the BWF start time has to be converted also
    * Fix bug that prevented fade-ins from being restored in an inactive state
    * Remove almost all use of Glib::ustring to avoid issues with non-Latin characters in file names on some versions of OS X
    * Do not attempt to lookup sndfile constants/enums using a string, because this breaks when using anything but english
    * Allow correct restoration of Lock Edit mode