I am using your plugin on 2 of my sites, my blog & web site. The plugin works fine on all browsers on the Mac and in Safari and Firefox on PC. However in IE7 the content appears half way down the page.
(if you click on "portfolio" the shadowbox is loaded but not in the centre)
The same here http://blog martinbennett.com/
(if you click on "slideshow" the shadowbox is loaded but not in the centre)
I saw on the shadowbox web site that having the right doc type is important. I tried lots of different doc types without success.
I also read on other posts that there are issues with IE7 and that you might be working on a fix or a version that works with shadowbox 2.
In the meantime if you have a moment could you look at my sites in case i am making a obvious mistake!