When using WebDrive to connect to an Amazon S3 bucket, sometimes the directory listing is empty.
This could happen if the bucket is located in a different Amazon S3 Availability Zone. To correct this issue, run WebDrive and edit the Site Profile Settings for the S3 Site you have configured. Go to the Amazon S3 Settings view and toggle the setting for 'Use Virtual Hosting Syntax'; you may need to try both enabled and disabled to see which one works.
Save the changes and then remount the S3 volume.