I installed audacious and audacious-plugins from repository. After launching it, the UI doesn't have menu bar and no context menu on playlist. Reinstalling the software didn't resolve this problem.
Please find the following errer message in Terminal (and there's no "ui" folder under /usr/share/audacious):
felix@slitaz:~$ audacious
** (audacious:13656): CRITICAL **: Error loading player.ui: Failed to open file '/usr/share/audacious/ui/player.ui': No such file or directory
(audacious:13656): Gtk-CRITICAL **: gtk_box_pack: assertion
GTK_IS_WIDGET (child)' failed
(audacious:13656): Gtk-CRITICAL **: IA__gtk_widget_show: assertion GTK_IS_WIDGET (widget)' failed
Thanks very much for any help.