Event could not be created because of a server error
I realized that none of the calendar entires made on any of my iOS devices (iPad 3, iPhone 4S, iPhone 3GS, all on 6.0.1), sync to iCloud.com anymore. Same goes for iCal my two Macs (both 10.8.2). Subsequently of course, events created on any device are not propaged to the other devices. This seems to be this way since a couple of weeks.
When I try to make an entry directly on iCloud.com, after a couple of seconds, I get the following error: "Couldn't create "<<< Event name >>>". This event couln't be created because of a server error. Please try again." Goes without saying that repeating this does not change anything. This behaviour is completely reproducable on Safari and Chrome.
I should add that iCloud syncing for contacts works flawlessly, also when entering directly on iCloud.com. Funny enough, my wife had the very same issue on her account (a former family MobileMe account), but it went away by itself.
Any ideas?
iOS 6.0.1