Index: /trunk/admin/include/functions_upload.inc.php
===================================================================
--- /trunk/admin/include/functions_upload.inc.php	(revision 12917)
+++ /trunk/admin/include/functions_upload.inc.php	(revision 13030)
@@ -335,4 +335,22 @@
   invalidate_user_cache();
 
+  // cache thumbnail
+  $query = '
+SELECT
+    id,
+    path
+  FROM '.IMAGES_TABLE.'
+  WHERE id = '.$image_id.'
+;';
+  $image_infos = pwg_db_fetch_assoc(pwg_query($query));
+
+  set_make_full_url();
+  // in case we are on uploadify.php, we have to replace the false path
+  $thumb_url = preg_replace('#admin/include/i#', 'i', DerivativeImage::thumb_url($image_infos));
+  unset_make_full_url();
+  
+  fetchRemote($thumb_url, $dest);
+  
+
   return $image_id;
 }