Sorry guys, I am just trying to reopen the topic:
http://wordpress.org/support/topic/plugin-image-widget-searching-media-library-problem?replies=3
because it has not been resolved and the problem still holds! I’m running WP 3.2.1 with Image Widget 3.2.11 and there are still troubles with some images that won’t load into the widget from the media library (freshly uploaded files work fine though).
Anyone has any idea how to solve this ?