Arch Linux

Description: LXDE Menubutton in lxpanel do no work

Additional info:
ommunity/gpicview 0.2.2-1 (lxde) [Installiert]
Picture viewer of the LXDE Desktop
community/libfm 0.1.14-5 (lxde) [Installiert]
the core of next generation file manager PCManFM
community/lxappearance 0.5.0-1 (lxde) [Installiert]
GTK+ theme switcher of the LXDE Desktop (manages icons and fonts)
community/lxde-common 0.5.0-3 (lxde) [Installiert]
Common files of the LXDE Desktop
community/lxde-icon-theme 0.0.1-1 (lxde) [Installiert]
LXDE default default icon theme based on nuoveXT2
community/lxdm 0.3.0-1 (lxde) [Installiert]
Lightweight Display Manager (part of LXDE)
community/lxlauncher 0.2.1-3 (lxde) [Installiert]
Launcher for Asus EeePC (part of LXDE)
community/lxmenu-data 0.1.1-1 (lxde) [Installiert]
freedesktop.org desktop menus for LXDE
community/lxnm 0.2.2-2
A Network Manager (Part of LXDE)
community/lxpanel 0.5.7-1 (lxde) [Installiert]
Panel of the LXDE Desktop
community/lxrandr 0.1.2-1 (lxde) [Installiert]
Monitor configuration tool (part of LXDE)
community/lxsession-lite 0.4.5-1 (lxde) [Installiert]
Session manager of the LXDE Desktop (light version)
community/lxtask 0.1.4-1 (lxde) [Installiert]
Task manager of the LXDE Desktop
community/lxterminal 0.1.10-1 (lxde) [Installiert]
VTE-based terminal emulator (part of LXDE)
community/menu-cache 0.3.2-1 (lxde) [Installiert]
Caches to speed up freedesktop.org's application menus use.
community/openbox 3.4.11.2-2 (lxde) [Installiert]
A window manager for the X11 windowing system
community/pcmanfm 0.9.8-6 (lxde) [Installiert]
File manager of the LXDE Desktop

If i klick to the Menubutton
no Menu open, but shortcuts like: Firefox, minimize all windows, Fileman work.

Steps to reproduce:

Login as some user
klick to the Menubutton.