Thanks. I think Super Cache probably has something to do with it - can you try disabling that for a test?
Also, the linking of the thumbnail to the website is partially controlled by the layout template. The "Right" layout makes the images into links. The "left" layout leaves them without links.
ShrinktheWeb recently introduced an intermediary screen for free accounts so I try to give you the choice.
If you have any problems modifying the layout template, give me a shout via http://www.2020media.com.