diff --git a/PROMS/Volian.Controls.Library/StepTabRibbon.cs b/PROMS/Volian.Controls.Library/StepTabRibbon.cs
index bcb17838..07f3c395 100644
--- a/PROMS/Volian.Controls.Library/StepTabRibbon.cs
+++ b/PROMS/Volian.Controls.Library/StepTabRibbon.cs
@@ -1526,7 +1526,7 @@ namespace Volian.Controls.Library
 		private void btnUndo_Click(object sender, EventArgs e)
 		{
 			_MyStepRTB.Undo();
-			if (_MyStepRTB.WasXDelete && (_MyStepRTB.Text[_MyStepRTB.SelectionStart - 1] == 'X'))
+			if (_MyStepRTB.WasXDelete && _MyStepRTB.SelectionStart > 0 && _MyStepRTB.TextLength > 0 && (_MyStepRTB.Text[_MyStepRTB.SelectionStart - 1] == 'X'))
 			{
 				_MyStepRTB.Undo();
 				_MyStepRTB.WasXDelete = false;
@@ -1566,6 +1566,11 @@ namespace Volian.Controls.Library
 					myROID = lt.MyRoUsageInfo.ROID.ToLower();
 					myRODB = lt.MyRoUsageInfo.MyRODb;
 				}
+				if (myROID.StartsWith("ffff"))
+				{
+					MessageBox.Show("Unit Information RO's cannot be edited", "Unit Information RO", MessageBoxButtons.OK, MessageBoxIcon.Information);
+					return;
+				}
 				//string roapp = Environment.GetEnvironmentVariable("roapp");
 				string roapp = Volian.Base.Library.ExeInfo.GetROEditorPath(); // get the path to the RO Editor Executable
 				string args = "\"" + myRODB.FolderPath + "\" " + myROID;