I like this extension! I recently upgraded to magento 188.8.131.52 and also updated to the latest version of Easy lightbox (1.0.1).
Since then only the base image appears in the lightbox. All other images are replaced by the default magento “no image"-image. (attachment).
I’ve just downgraded to the 0.57 version. This version doesn’t seem to have the issue (version 1.0 is not working either).