I make changes on the calendar of my MacBook Pro but the changes do not take and revert to what the entry was prior.

For the past week or so, I have made changes to the calendar on my MacBook Pro. The changes do not "stick" on my MacBook calendar and do not sync with any other device (iPhone or iPad). I just can't figure this out. Anyone have any suggestions?

By everything, I am assuming you have tried resetting the SMC (http://support.apple.com/kb/HT3964) and PRAM (http://support.apple.com/kb/ht1379). If you haven't tried this yet, please do!
See the following support document as well: http://support.apple.com/kb/TS1367.
The update you're talking about was the firmware update. Hopefully resetting the PRAM gets you up and running. Try resetting it 3 times in a row (hold the keys down until you hear 3 startup chimes).
Message was edited by: adamb529

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