I have a product with 4 images attached. All 4 thumbnails show under the main image on the product detail page. If I click any one of the thumbnails it is anyone's guess whether I will see the thumbnail image or the full image. As I click the same image over and over I will typically see at least one thumbnail size display and several full size images display...there is no pattern to it.
I am using the standard default_images template which does the following:
echo '<div class="floatleft">' . $image->displayMediaThumb('class="product-image"', true, 'class="modal"', true, true) . '</div>'; //'class="modal"'
Any ideas?