Calendar entries not showing in all views

Hi,

I have a strange problem… a user has meetings and reminders in his calendar. Most of these display in all of the views, day, week, month and meetings. However for one week (14/0/6/04) you can only see the entries in the month and meetings views but not in the day or week views. We use the standard mail template and I have replaced the design and refreshed the views but no joy.

Any ideas?