Music don't play at all on debian Sid

Hi,

I've installed LMS 7.7.2 on my debian system, and whenever I choose title, both directly from squeeze box and on the virtual remote, nothing happens ... no music is playing.
On the squeezebox, no progression bar
On the localhost:9000, progression bar is shown but there is no sound.
Here's my configuration, according to server info :
Logitech Media Server Version : 7.7.2 - r33893 @ Wed Mar 14 05:46:46 PDT 2012
Nom d'hôte : debian
IP : 127.0.0.1
Port HTTP : 9000
SE : Debian - FR - utf8
Plate-forme : x86_64-linux
Version de Perl : 5.14.2 - x86_64-linux-gnu-thread-multi
Version de la base de données : DBD::SQLite 1.34_01 (sqlite 3.7.7.1)
Platines identifiées : 1
(I'm french, so information are in french, can translate for you if needed)

Someone got an idea ?
For info, i've checked logs and no errors are reported.

That's strange, because everything worked when the system was installed, few weeks ago ... perhaps it comes with a system update, but as i don't use the squeezebox everyday, i can't say when it stopped working