iCloud Photos website is not showing thumbnails

Hi all,

I am using the iCloud photo library between my iPhone and iMac and I access my iCloud from work (Windows environment) when I need a photo.

It used to work before but since some time the thumbnails are not showing anymore of the photos in iCloud Photos website.

When I click any of the photos it's giving me a loading error.

Does any one know why this is occurring?

Thanks!