Q: Why isn't Calendar syncing with iCloud

As of May 21st Calendar on MacBook Air has stopped syncing to iCloud, hence to iphone and ipad. Being that Calendar is usually the first place i put entries and where i do most of my planing, i need to know Why It's Not Working. When i add to the mac it goes nowhere, however i can add to iphone or ipad or icloud.com and it makes its way around to all other devices except for mac.

This is from the sync log

2013-06-11 12:12:59:000|SyncServer|43762|0x7f8ee9c0be60|SyncServer|Warning| Refreshing watchdog because of a calendar time change alert.

2013-06-11 12:27:02:000|SyncServer|43762|0x7f8ee9c0be60|SyncServer|Warning| Refreshing watchdog because of a calendar time change alert.

2013-06-11 12:29:56:990|SyncServer|43762|0x7f8ee9c0be60|Server|Info| Cancelling all sync plans.

2013-06-11 12:29:57:092|SyncServer|43762|0x7f8ee9c0be60|Server|Info| Goodnight, Gracie.

2013-06-11 19:58:02:977|SyncServer|45053|0x7fa34840be60|Logging|Info| Logging initialized, engine version 713.1 : log level 3

2013-06-11 20:00:03:725|SyncServer|45053|0x7fa34840be60|Server|Info| Cancelling all sync plans.