[O] cannot get an agenda showing logged todos, scheduled todos and clockcheck items at the same time

[Rainer Stengele]

Dear all,

I cannot get an agenda showing logged todos, all scheduled items and clockcheck 
view for gaps or overlappings clocking.
I start with log mode "on" and my agenda shows all scheduled todos.
As soon as I hit "v c" to see the clockchecks result the scheduled todos 
disappear.

Is there any way for an agenda to always see all logged todos, all scheduled 
todos and always get the clockcheck view in order to see gaps or overlaps?

My agenda is configured like:

..
          (agenda "todays agenda"
                  (
                   (org-agenda-span 'day)
                   (org-agenda-log-mode 'clockcheck)
                   (org-agenda-start-with-log-mode t)
                   (org-agenda-overriding-header "Today's Agenda")))
...

I never could get a configuration which also shows the clockcheck items.
I therefore start as configured and as as said soon as I press "v c" my 
scheduled items disappear.

Any idea?

Thank you.
Regards, Rainer