Here is a work around and it IS WORKING in Opera AND ie6 for me like this. To answer the previous post, the problem (at least the ones i encountered with ie6) was the images being rendered on the screen in some place that you can’t see them nor can you click the close or next options etc. Since the problem seems to lie in the way the plugin communicates with THICKBOX you can easily get around it by using LIGHTBOX instead.
Install the Lightbox plugin and set the Next Gen plugin (under Gallery-> options -> effects -> “javascript Thumbnail effect” select LIGHTBOX.
Seems to fix the problem for me! Let me know if that works for you please! This problem is very interesting I wish I were a coder to help more.
I am working on a site for a rock band click here to see the plugin in action compatible with ie6 and opera.
I HAVEN’T DONE any testing of other browsers including ie7 etc.
This plugin is so awesome it would be a shame for anyone to pass it bye!