diff --git a/DDUtilityApp/Properties/AssemblyInfo.cs b/DDUtilityApp/Properties/AssemblyInfo.cs
index f8f6cfe..badabe7 100644
--- a/DDUtilityApp/Properties/AssemblyInfo.cs
+++ b/DDUtilityApp/Properties/AssemblyInfo.cs
@@ -32,5 +32,5 @@ using System.Runtime.InteropServices;
 // 모든 값을 지정하거나 아래와 같이 '*'를 사용하여 빌드 번호 및 수정 번호가 자동으로
 // 지정되도록 할 수 있습니다.
 // [assembly: AssemblyVersion("1.0.*")]
-[assembly: AssemblyVersion("2025.03.19.2")]
-[assembly: AssemblyFileVersion("2025.03.19.2")]
+[assembly: AssemblyVersion("2025.03.19.3")]
+[assembly: AssemblyFileVersion("2025.03.19.3")]
diff --git a/DDUtilityApp/TIBRENDEZVOUS/FrmSimulator01.cs b/DDUtilityApp/TIBRENDEZVOUS/FrmSimulator01.cs
index b11173c..24357ed 100644
--- a/DDUtilityApp/TIBRENDEZVOUS/FrmSimulator01.cs
+++ b/DDUtilityApp/TIBRENDEZVOUS/FrmSimulator01.cs
@@ -1008,7 +1008,7 @@ namespace DDUtilityApp.TIBRENDEZVOUS
                 {
                     if (ctrl.GetType() == typeof(Label)) continue;
                     else if (ctrl.GetType() == typeof(TextBox)) ((TextBox)ctrl).ReadOnly = true;
-                    else if (ctrl.GetType() == typeof(ComboBox)) ((ComboBox)ctrl).Enabled = false;
+                    else if (ctrl.GetType() == typeof(ComboBox)) { ComboBox cbox = ctrl as ComboBox; cbox.DropDownStyle = ComboBoxStyle.DropDownList; cbox.Enabled = false; }
                     else ctrl.Enabled = false;
                 }
             }
@@ -1038,7 +1038,7 @@ namespace DDUtilityApp.TIBRENDEZVOUS
                 {
                     if (ctrl.GetType() == typeof(Label)) continue;
                     else if (ctrl.GetType() == typeof(TextBox)) ((TextBox)ctrl).ReadOnly = false;
-                    else if (ctrl.GetType() == typeof(ComboBox)) ((ComboBox)ctrl).Enabled = true;
+                    else if (ctrl.GetType() == typeof(ComboBox)) { ComboBox cbox = ctrl as ComboBox; cbox.DropDownStyle = ComboBoxStyle.DropDown; cbox.Enabled = true; }
                     else ctrl.Enabled = true;
                 }
             }