Just a short question to confirm that: could it be that you started with an recurring event, and switched to single event prior to saving the time event?
Sven, Since you posted no replay, let me clarify that the error appears when changing a defined recurring time event, to a single event. For that a bug will be opened. Please next time, come back to the threads you opened and provide feedback (this is why you open them in the first place, right? [:)] ) Cheers,