Drupal 7 "Panel Nodes" Content Pane Contextual Filter
I urge you not to use Panel Nodes. Panel Nodes are being deprecated in favor of Panelizer. The largest hurdle to getting rid of them is that I need to complete the upgrade path. I suggest that you


Move to Panelizer, following the upgrade path issue if you already have Panel Nodes.
If necessary, repost a new question with regard to Panelizer.