diff --git a/PROMS/Volian.Controls.Library/DisplayTransition.cs b/PROMS/Volian.Controls.Library/DisplayTransition.cs
index 8f35419f..66691d7e 100644
--- a/PROMS/Volian.Controls.Library/DisplayTransition.cs
+++ b/PROMS/Volian.Controls.Library/DisplayTransition.cs
@@ -802,7 +802,13 @@ namespace Volian.Controls.Library
 				// if doing a 'new' range, no node is selected in tree.  Without this, the first node in the
 				// tree was the selected node which was throwing off the logic for defining the _RangeNode1 
 				// and _RangeNode2
-				if (_DoingRange) tvTran.SelectedNode = null;
+				if (_DoingRange)
+				{
+					tvTran.SelectedNode = null;
+					// if there was an existing range clear the range because the section selection had changed
+					// and these range values are no longer valid.
+					if (_RangeNode1 != null || _RangeNode2 != null) _RangeNode1 = _RangeNode2 = null;
+				}
 				_InitializingTrans = false;
 			}
 		}