WP version: 2.7 (Also happened on version 2.2, 2.6)
NextGEN version: 1.1.0
Theme: This occurs on all themes.
When viewing an image using NextGEN with a page under the image, using the TEXT widget to display an image based link, the image based link is over the NextGEN image, instead of underneath.
A screenshot of the problem can be seen HERE.