Bug in Calendar Appointment: constantly moving in time, not deleteable

[negg]

Could not find any similar issues on the list, so let me try to explain what happens in our up-to-date Zimbra with the AJAX-Webclient on Firefox:

An appointment I made a few days ago constantly moves in time and can't be deleted. That means, every time I update the calendar, the appointment starts at the now time. It does not show up in HTML-Calendar nor in the CalDAV, only in the AJAX-client, and I can't delete it there, too: pressing delete results in a message "Do you want to inform the organizer" and pressing Yes nothing happens.

I did not do anything special with the appointment. It was a single time event with two other Zimbra users invited (their appointments are still OK).

Any clue what this might be and how to remove that traveling appointment?

[negg]

Nobody? This is really quite annoying and I consider this a severe bug, as it corrupts the appointment database: the moving appointments no longer show up at their real time, so the user might easily miss them!

Is the Zimbra Development Team reading this forum?

[negg]

Ok, so I dug myself into the mysteries of the Zimbra database and found that it was really an emtpy starting time field in the appointments table.

I cured the problem by opening the calendar items im Mulberry and corrected the starting time.