Google has made a sudden change to their Contacts API service which invalidates many of the existing  OAuth tokens issued for synchronization by NuevaSync users.  Affected users need to request a fresh token through the NuevaSync control panel in order to restore normal sync functionality.

When logged into the NuevaSync site, if you see a red ‘X’ as the Google Contacts’ status, your account is almost certainly affected.

To repair this error, simply click the ‘Request Account Access’ button at and follow the prompts to obtain a new token.

If you have any problems or questions about obtaining a new token, do not hesitate to contact NuevaSync support.