I have a fairly odd problem with my subscribed calendars... Since upgrading to iOS 7 and Mavericks, I noticed that it was possible to put subscribed calendars in iCloud when adding them into Calendar in OS X - which is amazing, because I no longer have to add them into each and every device individually. Although, it doesn't work with all calendars. I have two that show up on the iPhone as a calendar - but no events are visible. The events are visible on the Mac. If I use the exact same URL and add it as a subscribed calendar on the iPhone, it works perfectly. So, I add a new subscribed calendar in OS X, I see the events on OS X, I see the calendar in iOS but not the events. If I add the same calendar in iOS, I see the events. The only thing I can think of is that the URL:s of the non-working calendars has /#!/ in them. Does anyone know if this is a known problem, or if there is a solution to it?