Openbox desktop no response to mouse clicks

Installed Debian 8.4 on Fujitsu LH531. Everything works great in Gnome, Cinnamon.

When I installed Openbox, its desktop has no response to mouse/touchpad clicks. But it works in applications (i.e. iceweasel, Gnome terminal, etc.). I can move the cursor around but button clicks won't work.

After some searching, I was able to configure rc.xml and use Alt+F1 to open the root-menu. The problem is button clicks still don't work at desktop.

The problem happens also to Blackbox and Fluxbox.

Any idea? Thanks.

#

Content of ~/.config/openbox/

autostart  
environment  
menu.xml  
rc.xml

The following is part of my rc.xml file. Right button is defined to show the root-menu but nothing is shown when I right-click on the desktop.

632     <context name="Root">
633       <!-- Menus -->
634       <mousebind button="Middle" action="Press">
635         <action name="ShowMenu">
636           <menu>client-list-combined-menu</menu>
637         </action>
638       </mousebind>
639       <mousebind button="Right" action="Press">
640         <action name="ShowMenu">
641           <menu>root-menu</menu>
642         </action>
643       </mousebind>
644     </context>

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