The latest build is up at:
https://files.jriver.com/mediacenter/channels/v20/latest/MediaCenter-20.0.131-amd64.deb (also in the latest apt repository)
20.0.131 (7/27/2015)
1. Changed: Relaxed system library requirements more to help with portability.
2. Changed: Changes from the main branch
20.0.129 (7/14/2015)
1. Fixed: The focus fix from 20.0.123 was incomplete and was preventing the DSP studio (amongst others) from showing properly on hover.
2. Changed: All MC windows are class hinted properly now.
20.0.123 (6/23/2015)
1. Fixed: MC will no longer take focus from other apps on state transitions (unless MC has the mouse cursor).
2. Fixed: Ratings in the Purity Skin.
20.0.122
1) Changed: Changes from the main branch.
20.0.114
1) Changed: Reduced use of system libraries.
20.0.110
This is compiled on the new (4/25/2015) debian Jessie release.
It will run on ubuntu 14.10 without needing non-ubuntu files.
It will NOT run on 14.04 (because of issues with libgnutls28). If you are using 14.04, stick with the i386 version.
For the linux specific changes see the i386 linux version announcement and for general changes see the most recent windows announcement.
Only amd64 specific issues should be added to this thread. Put general linux issues in the JRiver Media Center 20.0.xx for Debian threads.