Unable to change sink output from one source with gnome system sounds enabled

Binary package hint: pavucontrol

Unable (or very difficult) to change sink output from one source. When I press the button to send the source sound to another output (the system sound of this button pressed) disables my selection and the menu don't appear. If I disable the system sounds everything is working perfect.

Is very easy to reproduce. Try to do it with systems sounds enabled and disabled, you will understand where is the problem.

ProblemType: Bug
Architecture: i386
Date: Thu Oct 8 17:10:20 2009
DistroRelease: Ubuntu 9.10
NonfreeKernelModules: nvidia
Package: pavucontrol 0.9.8+git20090701-0ubuntu2
ProcEnviron:
 LANG=es_ES.UTF-8
 SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.31-12.41-generic
SourcePackage: pavucontrol
Uname: Linux 2.6.31-12-generic i686