After some time of using this plugin all the images become broken and have server address bit being lost in img src attribute. To fix the issue I manually empty web site cache. Once cleared, it works for a while (usually I spot myself and manually fix this once a day), but after some time have server address bit missed again in the src attribute.

E.g. the single image's tag looks like this: 

  <img width="960" height="451" alt="We setup your own secure web hosting company FAST from A to Z" src="http:///sites/default/files/styles/banner-960-451/public/slideshow-images/reseller-turn-key-solutions.jpg" typeof="foaf:Image" style="display: none;">

Any ideas? Let me know if I can help you reproducing the issue.
Using Drupal 7.9