Works fine in all of my 4.x installs. Although without the image count code, you'll get a blank "Detailed Image" box when there is not a 2nd detailed image.
If you don't see anything, I suspect:
1. You product image is still scaling down to the desired thumbnail size or you only have 1 detailed image. You'll need three images for Deonya's code to be effective.
mike.//
__________________
4.1.9
|