I have a number of calendars on the Calendar app on my MacBook Pro (OS X Mountain Lion 10.8.2): along with the three standard iCloud calendars (Calendar, Home, Work) I have 7 subscriptions. I have tried a number of things, but it seems none of my calendars except the three standard ones want to appear on iCloud.com. Is this an irreparable bug with the Apple software/servers, or is there something I can do to fix this issue here?
Note: It's odd that the calendars and indeed the list of iCloud subscriptions still seems to sync fine with my iPhone. It's just that none of them display on iCloud.com for whatever reason!