Index: moodle/lib/ajax/section_classes.js
--- moodle/lib/ajax/section_classes.js Base (1.57)
+++ moodle/lib/ajax/section_classes.js Locally Modified (Based On 1.57)
@@ -146,8 +146,8 @@
     this.resources_ul = this.content_div.getElementsByTagName('ul')[0];
     var i=0;
     while (this.resources_ul && this.resources_ul.className != 'section img-text') {
+        this.resources_ul = this.content_div.getElementsByTagName('ul')[i];
         i++;
-        this.resources_ul = this.content_div.getElementsByTagName('ul')[i]; i++;
     }
     if (!this.resources_ul) {
         this.resources_ul = document.createElement('ul');
@@ -162,7 +162,7 @@
     }
 
     var sum = YAHOO.util.Dom.getElementsByClassName('summary', null, this.getEl());
-    if (sum[0]) {
+    if (sum[0] && sum[0].firstChild) {
         this.summary = sum[0].firstChild.data || '';
     } else {
         // orphaned activities