I was looking at the new skywalker tutorials (part 6) and tried to turn on shape tracing but to my surprise there were no child items in the shape tracing panel and I was getting an error:
Microsoft JScript runtime error: Unable to get value of the property 'alternate': object is null or undefined.
I am using IE9 but somehow the Document Mode was configured to use the IE7 standards. When I changed it to use the IE9 Standards everything works ok. I am using the latest Orchard, 1.3.10.
I decided to try configuring IE9 to use IE8 standards and this worked a little better; the left panel of the shape tracing now displays child nodes, but nothing is displayed under any of the tabs in the right panel and I do get the same Microsoft JScript
Just thought I'd put this here in case anyone else has the problem.