django-storages s3boto backend uploaded file links are broken
===

I am using django-storages' s3boto backend as my default storage backend. 

If I upload to my publicly accessible bucket via AWS console, I have no problem accessing it. If I use my Django form to save a file, the file appears in the AWS console with its correct size. But the link to file displays a broken image, both using AWS's `open` menu command and in the Django admin.

My relavent settings are:

    AWS_ACCESS_KEY_ID = '***'
    AWS_SECRET_ACCESS_KEY = '***'
    DEFAULT_FILE_STORAGE = 'storages.backends.s3boto.S3BotoStorage'
    AWS_STORAGE_BUCKET_NAME = 'mybucket'
    AWS_QUERYSTRING_AUTH = False

This is my bucket policy:

    {
        "Version": "2008-10-17",
        "Id": "Policy1342590611617",
        "Statement": [
            {
                "Sid": "AllowPublicRead",
                "Effect": "Allow",
                "Principal": {
                    "AWS": "*"
                },
                "Action": "s3:GetObject",
                "Resource": "arn:aws:s3:::mybucket/*"
            }
        ]
    }

What do you think I might be doing wrong?