[Plugin: NextGEN Gallery] Edit Thumb Issue

I have an interesting problem that I can not find an answer for here in the forum. I have a site I am working on that has WordPress 2.9 with NextGEN version 1.4.3. When I first worked on the site, I was able to edit the thumbs via gallery/ manage gallery/ edit thumb. In the customize Thumbnail window everything works as normal. I select the area in the main image, click update, the new thumb appears in the admin area, i check its selection box & click save changes. The Thumbnail in the admin area is changed, but the thumbnail on the front end of the site stays the same & does not update even after clearing the cache & refreshing. I am really at a loss here and would appreciate any feedback. Thanks in advance.