Try using another more advanced extension for zooming - Zoom Pro.
It all should work fine. And in case you would have any issues our support team will happily come to help.
Here are some of the features:
-Attractive zoom both for main and thumbnail images
-Carousel for thumbnails with ability to change its position
-Customers can zoom product images at category pages
-Lightbox for product large images with thumbnails
-Very many options for zoom and lightbox configuration