Here is a simple fix for the Application\ContextHelper.cs to get the right node based on the configuration changes you did.
//var homeNode = helper.TypedContentAtXPath("//root//Dialog").FirstOrDefault();
var homeNode = helper.TypedContentAtXPath("//root//"+ DialogConfiguration.Instance.DocTypeForumRoot).FirstOrDefault(); //TODO: This needs to get the front page of the Forum
Here is a simple fix for the Application\ContextHelper.cs to get the right node based on the configuration changes you did.
Hope it helps.