I have a specific subscribed calendar that, despite me subscribing to it in iCal, on my Mac, and subscribing to iCloud, does not display the calendar events in iCal. The shared calendar is visible as an option in the Calendars list (and it is checked), but no events show on any of my three Macs that use that iCloud account. However, the calendar events all show up just fine on all my iOS devices (2 phones and 2 pads). And the only way those devices got the calendar in the first place was because I subscribed in iCal on the Mac. Any ideas why this might be happening?