[Kontact 4.7.3] reminder doesn't work reliable

Since update to Kubuntu 11.10, now I use Kontact 4.7.3, the reminder doesn't 
work, like before. If an event is scheduled while KDE is running, all works fine 
but if an event or a task is scheduled before KDE is running, there is no 
reminder triggered on startup of KDE.
 
Before update, at the start of KDE all events since the last shutdown are poping 
up in a reminder-window. This was very useful for full-day-tasks. Since the 
reminder doesn't work, I can't see what's to do today at the start of the day.
 
I start KOrgenizer during start of KDE, so the "Erinnerungsmodul" (reminder-
module) is running all the time and shown in the system tray.
 
Please, I'm desperately seeking for help.

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