9.1.5 Release Notes
Improvements and feature changes:
Minor improvement to ensure compatibility with Mac OS X’ Gatekeeper for the forthcoming OS X updates 10.9.5 and 10.10.
Improved the threshold for inverting text colour of clip names, chains, macros, etc., depending on the background color, for better readability.

Bugfixes:
The [live.thisdevice] Max for Live object would no longer send a bang message out its first outlet when adding/removing control surface scripts in the Live preferences.
Under certain conditions, the MIDI level indicator would not show any activity inside the routing chooser of a MIDI track.
The Send button on the APC40 MKII would not work when pressed for the first time.
The Launchpad's Mixer mode would stop working after using the Launchpad's Session Zoom feature in Live sets containing more that 8 tracks.

Changes for Push:
When using a low audio buffer size or high sample rate, Push's buttons would not be backlit after launching Live (Windows only).
When entering Scales mode on Push, the Selection and State Control buttons would not light up until one of them is pressed once.
Push's Duplicate button would not work anymore for clips, tracks and scenes if Clip workflow is selected.