I have an iMac - running Mavericks - and iPhone 5s - on 8.4.1 , until recently if I made a change to a Calendar on either device it automatically updated on the other but for some reason this has stopped happening. AFAIK I have not made any changes or updates. I have also noticed that the Contacts list has also not updated when I made some changes on the iPhone. Yet Photos I take with the iPhone appear in the Photostream on iPhoto. Any ideas what might have caused this? I have checked that all the relevant boxes are ticked in iCloud settings.