Update from Airhead:
Following feedback and consultation with many Google Apps customers, we have made a significant improvement to the way Airhead integrates with Google Apps. In order to facilitate the improvements, all existing Google Apps customers will be asked to grant permission again for Airhead to link up with their Google Apps account. Once the changes have been made, you will see a message like this the next time you sign into Airhead using you Google Apps account:
Find out more on the Airhead Help Site.