Ok, so I took the example from here: http://blogs.infragistics.com/blogs/radoslav_minchev/archive/2010/12/18/manual-crud-webhierarchicaldatagrid.aspx

To test the WHDG CRUD capabilities. It was working fine. Later, I decided to upgrade to version netadvantage 11.1 and now the thing broke:

{"The default value string, , for column ActorID cannot be converted to the correct type, System.Int32."}

I tried in a different project and I get the same System.InvalidCastException. So what is going on?