Problems loading pane layout

The following is some code that demonstrates how we are saving and loading the pane layout to a file.  We are running into an issue while loading.  The panes load and appear in the correct locations.  However, if we save a layout that has all the panes floating, and then load, the application does not respond to left mouse clicks except on the docking pane manager's frame window (which is inside an MDI Child Frame).  All other MDI child frames don't respond to mouse clicks until a mouse click occurs within the docking pane manager frame window.  Can you please see whether there is something wrong with the following code?

Thank you,
Beaux

  //
  // Save code.
  //
  CString strLayout;
  CXTPPropExchangeXMLNode px( FALSE, 0, STR_XML_SETUP );
  if (px.OnBeforeExchange())
  {
    CXTPPropExchangeSection pxDockingPane( px.GetSection(STR_XML_DOCKING_LAYOUT) );
    Imp()->paneManager.DoPropExchange( &pxDockingPane );
    strLayout = px.GetXML();
    // Save strLayout to file
  }

  //
  // Load code.
  //
  CString strLayout
  CXTPPropExchangeXMLNode px( TRUE, 0, STR_XML_SETUP );
  if (px.LoadFromString( strLayout ))
  {
    px.SetLoading( TRUE );
    CXTPPropExchangeSection pxDockingPane( px.GetSection(STR_XML_DOCKING_LAYOUT) );
    Imp()->paneManager.DoPropExchange( &pxDockingPane );
  }