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replace the two block ui files in woocommerce with these:

https://github.com/woothemes/woocommerce/blob/master/assets/js/jquery-blockui/jquery.blockUI.js

https://github.com/woothemes/woocommerce/blob/master/assets/js/jquery-blockui/jquery.blockUI.min.js

This might not work, so try using the jquery updater plugin

This might break the fancybox lightbox, in which case: 

disable lightbox in woocommerce admin panel

edit woocommerce > single-product > product-thumbnails.php

if you're using simple lightbox plugin, add this to the thumbnail link:

rel="slb_group[650_gallery_1] slb slb_internal"

so it'll look like this

printf( '<a href="%s" title="%s" rel="slb_group[650_gallery_1] slb slb_internal" class="%s">%s</a>', wp_get_attachment_url( $attachment->ID ), esc_attr( $attachment->post_title ), implode(' ', $classes), wp_get_attachment_image( $attachment->ID, apply_filters( 'single_product_small_thumbnail_size', 'shop_thumbnail' ) ) );