"May I suggest that if this module is not working that you re-check your install. Most issues reported with this module are DIRECTLY linked to an incorrect install.. Also you need to review the readme for this module and Image Handler as there are specific instructions in both readme files for how to install BOTH modules together (and I will not re-post the contents of the readme here.. the instructions are pretty clear on how to install both modules together)"

Thank you. I re-uploaded the /includes/MY_TAMPLATE/additional_images.php and that cured the the problem with the old default popup windows. Now only light box popup windows appear on a click.

The second issue - the issue with missing navigation arrows - still remains. When a lightbox window pops up there no arrows to move between additional images for a product. However, a hyperlink, where the arrow(s) should appear, is in place and clicking on the right and left sides of the lightbox allows to move between the additional images for the product. Please let me know how to fix the missing arrow in lightbox problem.

Thank you.