Hi Hans-Peter,

At Wed, 15 Feb 2012 18:19:54 +0100,
Hans-Peter Deifel wrote:
>
> Hi all,
>
> [...]
>
> I played around in the source code and noticed that the following patch fixes
> the problem, but I don't know the code base well enough to understand why it
> works and what other implications it might have:
>
> [...]

I've applied a fix for this problem to master. Your patch did the
right thing; `org-prepare-agenda' was called by `org-agenda-list'
which already set up the done-keywords. But when `org-agenda-list' was
called in a block agenda `org-prepare-agenda' set the variable to nil
and left early.

Best and thanks,
  -- David