Nokia :: 5230 Calendar Missing From Home Screen

I've tried the search but can't find my solution.Until yesterday my home screen used to show upcoming appointments on the lower half of the screen. It now shows no appointments. I've tried all the obvious things but guess I either have a real problem or am missing something.1. There are loads of current appointments in my calendar. Many on each day and the reminders for those still alarm.2. Home screen is set to shortcut 3. I don't have any apps loaded that replace the home screen 4. settings/ personal/ home screen/ home screen gives me a list of options but calendar is no longer one of them . All I now have are shortcuts, search, music player and radio.
I'm reluctant to perform a hard reset or re-flash it as it took me ages to get the internet connection working correctly and I expect a reset will mess all that up again.