Cannot load calendar

Dear All,

When I load https://www.icloud.com/#calendar on my PC I get the error message "Cannot load calendar". Hitting the "Reload" buttn gives the same result.

I have used the iCloud calendar function on this PC daily for a long time.

Nothing has changed since it worked last night and there have been no upgrades, new installattions etc in the past few days.

All other iCloud functions work on my PC

The Calendar works on my iPhone and iPad

I have rebooted the PC

I have logged out and back into iCloud

All software is up to date

I have the same results with Chrome, IE and Forefox (and have cleared the cache on all the browsers)

Help!

What must I do to get my calendar to load?