Rhythmbox has a segmentation fault and disappears from the screen when "PLAY" is pushed. Why?

You may use Apport to file a bug. (In the menu of Rhythmbox -> Report a problem)
http://fridge.ubuntu.com/node/1908

In additon you may attach the output file to bug report while reproducing the issue:
rhythmbox --debug &> rhythmbox-debug.txt

and the package version:
apt-cache policy rhythmbox

also:
uname -r
lsb_release -d

ken@ubuntu:~$ rhythmbox --debug &> rhythmbox-debug.txt
Segmentation fault
ken@ubuntu:~$ apt-cache policy rhythmbox
rhythmbox:
  Installed: 0.12.0-0ubuntu4
  Candidate: 0.12.0-0ubuntu4
  Version table:
 *** 0.12.0-0ubuntu4 0
        500 http://us.archive.ubuntu.com jaunty/main Packages
        100 /var/lib/dpkg/status
ken@ubuntu:~$ uname -r
2.6.28-15-generic
ken@ubuntu:~$ lsb_release -d
Description: Ubuntu 9.04
ken@ubuntu:~$

Rhythmbox still fades away, no sound

ken@ubuntu:~$ rhythmbox --debug &> rhythmbox-debug.txt
Segmentation fault
ken@ubuntu:~$ apt-cache policy rhythmbox
rhythmbox:
  Installed: 0.12.0-0ubuntu4
  Candidate: 0.12.0-0ubuntu4
  Version table:
 *** 0.12.0-0ubuntu4 0
        500 http://us.archive.ubuntu.com jaunty/main Packages
        100 /var/lib/dpkg/status
ken@ubuntu:~$ uname -r
2.6.28-15-generic
ken@ubuntu:~$ lsb_release -d
Description: Ubuntu 9.04
ken@ubuntu:~$ rhythmbox
I: caps.c: Limited capabilities successfully to CAP_SYS_NICE.
I: caps.c: Dropping root privileges.
I: caps.c: Limited capabilities successfully to CAP_SYS_NICE.
Segmentation fault
ken@ubuntu:~$ rhythmbox --debug &> rhythmbox-debug.txt
Segmentation fault
ken@ubuntu:~$ gedit rhythmbox-debug.txt
ken@ubuntu:~$

this question #83457 and
https://answers.launchpad.net/launchpad/+question/83531
converted to
https://bugs.launchpad.net/ubuntu/+source/rhythmbox/+bug/434821