same here.
I'm facing the same problem when running the demo of:
1. Subgrid
2. Master Detail grid (By copying all the codes and run, I found that master table can show, detail grid cannot show)
In Internet Explorer, the error is like this:
A runtime Error has occured.
Line 18
Error: Object doesn't support this property or method
When click on the row to wait for detail grid load, it shows:
Line:68
Error: 'this.p' is null or not an objecct
Get Selected id's is not working, the live demo at here also having the same problem
http://trirand.com/jqgrid/jqgrid.html#