Splitview with core data not calling DetailRootController

Question

I'm running a splitview core data template setup for an iPad app. When a row was selected on the left tableview it would case the selected object of the row to be assigned to the right side view(DetailViewController) and update the view with the proper data. Below is the code that does the assigning in the left side controller(RootViewController).

• (void)tableView:(UITableView *)aTableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
  {
  // Set the detail item in the detail view controller.
  NSManagedObject *selectedObject = [[self fetchedResultsController] objectAtIndexPath:indexPath];
  detailViewController.detailItem = selectedObject;
  }

My problem that this has stopped working. The assignment to the detailViewController does nothing now. After the assignment it should jump to the detailViewController but it never jumps there. I've checked all the links in Interface Builder and they look all in place. I can't figure out what I did to make this stop working. Any tips on where I should check?

-Anthony