Mac calendar not syncing with icloud

OSX 10.8.3

Calendar Version 6.0 (1648)

Few days back the calendar stops syncing with icloud. iPhone/iPad/Web is still syncing well, but the Calendar application on my Mac is not.

I see only "Updating ..." and it never disappears.

I tried:

- restarting the Calendar

- removing cache of the application home/Library/Calendars/Calendar Cache + restart

- activating/deactivating of icloud serivce in Preferences/iCloud

Nothing helped. What more I see no events and no icloud calendars.

What is wrong? What should I try to do to force it to work?