In case anyone else comes along, I had the same problem using Apache 2.4.6 (Ubuntu). It had to do with apache not having permission to /usr/lib/iipimage-server. I simply copied that to /usr/share/iipimage-server and adjusted the path in iipsrv.conf and the url worked.
Fusion Tables doesn't store images, but will display them when given a URL. Enter the URL of the image in a cell in Fusion Tables. The image must be viewable without having to sign in.
During import,