When moving resources by drag and drop, there is a strange behavior if the summary of the section contains ul tags. The problem comes from the fact that the resources_ul is identified as the first ul in the content_td. The fix consists of finding the first ul which has a classname of section and use it as the resources_ul.

This snippet shows the place where the problem comes from as well as the proposed fix.

In file /lib/ajax/section_classes.js
In function section_class.prototype.process_section

Line 139:
// Find/edit resources
//this.resources_ul = this.content_td.getElementsByTagName('ul')[0];

// Fix:
var all_uls = this.content_td.getElementsByTagName('ul');
i = 0;
while (i < all_uls.length) {
if (all_uls[i].className == 'section')

i++;
}