diff --git a/PROMS/VEPROMS User Interface/frmVEPROMS.cs b/PROMS/VEPROMS User Interface/frmVEPROMS.cs
index a0d65ef0..cbef2230 100644
--- a/PROMS/VEPROMS User Interface/frmVEPROMS.cs	
+++ b/PROMS/VEPROMS User Interface/frmVEPROMS.cs	
@@ -261,6 +261,7 @@ namespace VEPROMS
 		/// <param name="e"></param>
 		private void tv_Click(object sender, EventArgs e)
 		{
+			tv.Enabled = false;
 			tmrTreeView.Enabled = true;
 		}
 
@@ -274,6 +275,7 @@ namespace VEPROMS
 			tmrTreeView.Enabled = false; // Timer has now fired
 			VETreeNode tn = tv.SelectedNode as VETreeNode;
 			if (tn != null) SetupNodes(tn);
+			tv.Enabled = true;
 		}
 		private void tv_BeforeExpand(object sender, TreeViewCancelEventArgs e)
 		{