On a clean user on first run one of the 4 messagges says:

Show Desktop: Global shortcut C+A+d+ cannot be registered

It looks like this conflict is caused by the openbox lxqt-rc.xml file.
Removing

 <keybind key="C-A-d">
    <action name="ToggleShowDesktop"/>
  </keybind>

from it solves here.
I forgot to control but I think C-A-d is set by lxqt-globalshortcuts already.