Ableton Live was recently updated to version 8.2.2. The update is a huge step forward for the "Max for Live" API, which gets added support for Rack-Devices (Devices inside Racks can now be accessed via the Max for Live API) and Return Tracks (Return tracks can now be observed via the Max for Live API). This is a recommended update for every Ableton user, especially when using max4live. The latest max/msp (Max 5.1.8) requires Ableton Live 8.2.2 to work.
The release notes according to Ableton: