Yesterday, I upgraded from Snow Leopard to Mavericks and enabled iCloud syncing, having previously sync'd via iTunes. So far so good. Everything that should sync did sync - until this evening. Now, the iMac's calendar looks as it should but the Calendar on the iPad (iOS7.0.3) now flashes the appointments on and off (i.e. now you see them now you don't) every couple of seconds. I've powered down the iPad and rebooted but the symptom persists. Is it iOS7.0.3, Mavericks, my iPad or my iMac? Has anyone else experienced this and does anyone have any suggestions as to how to overcome it? Thanks in advance.