certainly repeatable here, not much use if you can't reproduce it though!
[ 211.347679] mediacenter21[1174]: segfault at 3100000210 ip 0000000000f16ea2 sp 00007ffcac86aa20 error 4 in mediacenter21[400000+14d1000]
[ 4720.407007] mediacenter21[27888]: segfault at 7f7450042000 ip 00007f74a72d39b0 sp 00007f7484ff8610 error 4 in libX11.so.6.3.0[7f74a728e000+13c000]
not sure what info might be useful here
# ldd $(which mediacenter21)
linux-vdso.so.1 (0x00007ffc719d7000)
libcryptlib.so => /usr/lib/jriver/Media Center 21/libcryptlib.so (0x00007f1d4eac9000)
libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 (0x00007f1d4e889000)
librt.so.1 => /lib/x86_64-linux-gnu/librt.so.1 (0x00007f1d4e680000)
libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007f1d4e47c000)
libboost_regex.so.1.59.0 => /usr/lib/jriver/Media Center 21/libboost_regex.so.1.59.0 (0x00007f1d4e193000)
libX11.so.6 => /usr/lib/x86_64-linux-gnu/libX11.so.6 (0x00007f1d4de4f000)
libuuid.so.1 => /lib/x86_64-linux-gnu/libuuid.so.1 (0x00007f1d4dc4a000)
libstdc++.so.6 => /usr/lib/x86_64-linux-gnu/libstdc++.so.6 (0x00007f1d4d8cf000)
libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007f1d4d5c9000)
libgcc_s.so.1 => /lib/x86_64-linux-gnu/libgcc_s.so.1 (0x00007f1d4d3b3000)
libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f1d4d00f000)
/lib64/ld-linux-x86-64.so.2 (0x00005586d79e5000)
libxcb.so.1 => /usr/lib/x86_64-linux-gnu/libxcb.so.1 (0x00007f1d4cdec000)
libXau.so.6 => /usr/lib/x86_64-linux-gnu/libXau.so.6 (0x00007f1d4cbe8000)
libXdmcp.so.6 => /usr/lib/x86_64-linux-gnu/libXdmcp.so.6 (0x00007f1d4c9e1000)
# dpkg -S libX11.so.6.3.0
libx11-6:i386: /usr/lib/i386-linux-gnu/libX11.so.6.3.0
libx11-6:amd64: /usr/lib/x86_64-linux-gnu/libX11.so.6.3.0
# dpkg -s libx11-6:amd64
Package: libx11-6
Status: install ok installed
Priority: optional
Section: libs
Installed-Size: 1535
Maintainer: Debian X Strike Force <debian-x@lists.debian.org>
Architecture: amd64
Multi-Arch: same
Source: libx11
Version: 2:1.6.3-1
Depends: libc6 (>= 2.15), libxcb1 (>= 1.2), libx11-data
Pre-Depends: multiarch-support
Description: X11 client-side library
This package provides a client interface to the X Window System, otherwise
known as 'Xlib'. It provides a complete API for the basic functions of the
window system.
.
More information about X.Org can be found at:
<URL:http://www.X.org>
.
This module can be found at
git://anongit.freedesktop.org/git/xorg/lib/libX11
# dpkg -s libx11-6:i386
Package: libx11-6
Status: install ok installed
Priority: optional
Section: libs
Installed-Size: 1598
Maintainer: Debian X Strike Force <debian-x@lists.debian.org>
Architecture: i386
Multi-Arch: same
Source: libx11
Version: 2:1.6.3-1
Depends: libc6 (>= 2.15), libxcb1 (>= 1.2), libx11-data
Pre-Depends: multiarch-support
Description: X11 client-side library
This package provides a client interface to the X Window System, otherwise
known as 'Xlib'. It provides a complete API for the basic functions of the
window system.
.
More information about X.Org can be found at:
<URL:http://www.X.org>
.
This module can be found at
git://anongit.freedesktop.org/git/xorg/lib/libX11
# uname -a
Linux uridium 4.3.0-1-amd64 #1 SMP Debian 4.3.5-1 (2016-02-06) x86_64 GNU/Linux