Hi Gert,
Two possibilities:
(1) Are the forecasts old enough so that all the days have passed by now (meaning, are they at least 5 days old)? They probably are, but I need to make sure.
(2) Do these forecasts have an output time interval of 30 minutes (look at latest.txt to see easily)? They should. An hour is OK, too, as long as you are not using 3 iterations per interval).
If these two things are OK, then I can check into this further.
Tom