All my contacts are missing after maverick upgrade.

Hi Bvanam,

Welcome to the Support Communities! The article below will help you troubleshoot the issue you are having with Contacts missing on your Mac. Refer to the section entitled "Troubleshooting iCloud Contacts in Contacts on OS X Mountain Lion or later" for specific steps:

iCloud: Troubleshooting iCloud Contacts

http://support.apple.com/kb/ts3998

I hope this information helps ....

- Judy

When I recently encountered this problem (out of the blue) I checked Contacts/Preferences/Accounts. I discovered that the account described as "untitled source -- CardDAV" had somehow become disabled. Simply checking the "Enable this account" box rectified the problem. I have a MacBook Pro running OSX 10.9.5.