I just got Vista and started using Calendar and have found the same problem. I was able to get around it by clicking on the empty space on the left side right above Tasks and below the listing of calendars except that this changes the focus back to the calendar view which is somewhat inconvenient.
Savings Tasks in Calendar
I just got Vista and started using Calendar and have found the same problem. I was able to get around it by clicking on the empty space on the left side right above Tasks and below the listing of calendars except that this changes the focus back to the calendar view which is somewhat inconvenient.