Uploads to S3 not using the S3 URL

Hi,

I have configured the CDN settings correctly – the test button works and can access the bucket OK & I can also see any uploads in the bucket immediately. However the URL for the images on the site are referencing the server versions, the image src is…

http://myserver.com/wp-content/uploads/2012/10/Capture-300×178.png

whereas I think it should be like this…

http://mybucket.s3-website-us-east-1.amazonaws.com/wp-content/uploads/2012/10/Capture-300×178.png

I have followed the S3 setup instructions in the readme & cannot see any other obvious settings – am I missing a critical setting somewhere?

Thanks,
Paul

http://wordpress.org/extend/plugins/w3-total-cache/