I've reviewed many pages but really could not find the same problem that I am facing.

My zen 1.5.4, image handler 4 v432 with lightbox 1.6.5 or 1.6.4 (tried both versions) running at Xampp. I first installed image handler and then installed lightbox.

When I click the image (main product or additional image), about 1/5 chance that the image didn't display normally. i.e. there is no "next" "prev" "close" button at the image but a magnifier cursor that is able to zoom in/out when clicking image. Even refreshing page, no any change at all and I hanged at that page. I can return to product page only by clicking the backward key!

Click image for larger version.  Name: IMG_20170405.jpg  Views: 122  Size: 36.7 KB  ID: 17020

I’ve tried several times to install both version ( lightbox 1.65 or 1.64). But the problem is the same. And there is no error message in error logs.

Could anyone help me please? Thanks a lot!