Demo site non-functional due to S3 403 errors

[sukima]

The demo site is not functioning because every file to demo gets an Amazon S3 403 error:

<?xml version="1.0" encoding="UTF-8"?>
<Error>
  <Code>AllAccessDisabled</Code>
  <Message>All access to this object has been disabled</Message>
  <RequestId>S0C00EHRMVZE4R5K</RequestId>
  <HostId>4+eJW16fzNGBz7uxZ8+a+DHifGmyRTJlFo3rSyEXe+YJTw0POzPgS9+2+Zq9+GP3i+crZmE4ygM=</HostId>
</Error>