How to configure Notification on KOrganizer ?

[Florent Ourth]

Hello.
It's my first message, and I am a french KDE user, and my english is "soupe à 
la tomate" (bad). Sorry.
The first time I add an event in my calendar, I have operated the reminder 
notification 5 minutes before. And KOrganizer worked good, and prevent me
of my appointment 5 minutes before.
Since, It never do again. And I can't anderstand why.
And, the Item for configure the wav or program to execute make no effect.

A KDE Bug or a bug of my genius ?
Could you help me ? 
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