Address book not syncing to iCloud
I recently upgraded to Lion 10.7.2, but my contacts aren't syncing from iCloud into the address book. I've gone to system preferences, enabled iCloud and selected contacts. It doesn't take, and so when I go back to the preference window, it's back to being unchecked. In AB, there are no groups visible and I can't add an iCloud account there, either. The contacts are present in iCloud on the web interface. Calendars also seem to be working fine.
Any help would be appreciated.
MacBook, Mac OS X (10.7.2)