Reminders window won't show up after clicking in notifications center

After clicking a notificytion in notifications center on Mavericks the APP Reminders opens but the application window is not showing up. Allways worked like a charme but not any longer for me.

I tried to:

1) uncheck the iClound sync for Reminders while Reminders.app ist closed which deletes all local data!

2) logout my user

3) login again

4) open Reminders

5) check the iCloud sync for Reminders again

After this procedure, Reminder is working again for a day, then again the Reminders window is not showing up, after clicking a notification or open the Reminders.app manualy.

Why is this, any hints?

Cheers