I built it on stable and tried it. Same problem.
} weasel@orinoco:~$ blueman-applet
}
} (blueman-applet:6950): Gtk-WARNING **: 10:45:02.006: Theme parsing error: gtk.css:127:35: The style property GtkButton:child-displacement-x is deprecated and shouldn't be used anymore. It will be removed in a future version
}
} (blueman-applet:6950): Gtk-WARNING **: 10:45:02.006: Theme parsing error: gtk.css:128:35: The style property GtkButton:child-displacement-y is deprecated and shouldn't be used anymore. It will be removed in a future version
}
} (blueman-applet:6950): Gtk-WARNING **: 10:45:02.006: Theme parsing error: gtk.css:132:46: The style property GtkScrolledWindow:scrollbars-within-bevel is deprecated and shouldn't be used anymore. It will be removed in a future version
} blueman-applet version 2.1.1 starting
} Stale PID, overwriting
} blueman-tray version 2.1.1 starting
} Stale PID, overwriting
} Terminating blueman-tray
} blueman-applet 10.45.02 WARNING PluginManager:147 __load_plugin: Not loading PPPSupport because its conflict has higher priority
} blueman-applet 10.45.02 WARNING PluginManager:147 __load_plugin: Not loading DhcpClient because its conflict has higher priority
} blueman-applet 10.45.02 ERROR AgentManager:18 on_register_failed: /org/bluez/obex/agent/blueman org.bluez.obex.Error.AlreadyExists Agent already exists
} blueman-tray version 2.1.1 starting
} Stale PID, overwriting
}
} (blueman-tray:6968): Gtk-WARNING **: 10:45:02.477: Theme parsing error: gtk.css:127:35: The style property GtkButton:child-displacement-x is deprecated and shouldn't be used anymore. It will be removed in a future version
}
} (blueman-tray:6968): Gtk-WARNING **: 10:45:02.477: Theme parsing error: gtk.css:128:35: The style property GtkButton:child-displacement-y is deprecated and shouldn't be used anymore. It will be removed in a future version
}
} (blueman-tray:6968): Gtk-WARNING **: 10:45:02.477: Theme parsing error: gtk.css:132:46: The style property GtkScrolledWindow:scrollbars-within-bevel is deprecated and shouldn't be used anymore. It will be removed in a future version
but no systray icon.