Multiple problems with Calendar in Windows Live Mail

Hi

I am using Windows Live Mail 2012 on a Windows 7 machine for Email and Hotmail Calendar. I have some calendars which i have added myself and colour coded and an imported calendar within the Calendar.

For years this has worked well but today several issues have occurred.

1) All the calendars within Windows Live Mail Calendar have turned to the same colour (pink) so i cannot see which Event belongs to which calendar.

2) Some calendars have duplicated themselves in the tick list of calendars. e.g. there are two called "calendar" and another two called "Calendar" and an imported calendar appears three times with an identical name.

3) My imported calendar, although it appears three times in the tick list, and is ticked three times, is not showing any of its events. If i go to Calendar on the internet, the events are there.

4) Conversely, one of my calendars does show its events in Windows Live Mail, but is not showing its events on Calendar on the internet.

Please could you advise on fixing these issues

thanks ...