Group calendar question!Urgent

We upgrade our mail server to R6.0.1,but the group calender work not well! we can not see the other’s status by the picture of group calender.wo have to double-click on their name to open their calendar. And i find that when we set preferences ,wo can not creat schedule record in busytime.nsf(It is the question)!why (Sorry ,My English is not very well) thanks !