diff -ur original/uc_product/uc_product.module patched/uc_product/uc_product.module
--- original/uc_product/uc_product.module	2011-03-11 18:13:32.000000000 +0200
+++ patched/uc_product/uc_product.module	2011-04-06 20:50:54.000000000 +0300
@@ -1620,7 +1620,7 @@
   $output .= '</a></div><div class="more-product-images">';
   foreach ($images as $thumbnail) {
     // Node preview adds extra values to $images that aren't files.
-    if (!is_array($thumbnail) || empty($thumbnail['filepath'])) {
+    if (!is_array($thumbnail) || empty($thumbnail['uri'])) {
       continue;
     }
     $output .= '<a href="' . image_style_url('uc_product_full', $thumbnail['uri']) . '" title="' . $thumbnail['title'] . '"';