Multimedia keys and Xfce

[Pétùr]

Hello,

I have a keyboard with some multimedia keys. These were working until
recently. I binded them to "mpc next" "mpc prev", etc... to use it with
mpd.

Now I have no reaction when pushing "prev" "next" "stop/play" keys (all
mpc commands). The same command launched from a terminal are working
(and use to work with the keys).

Any idea why it is not working anymore? I checked apt log but couldn't
find removing of package linked (and I don't really know when it starts
not working).

Pétùr