diff --git a/src/ui/Forms/Assa/SetPosition.cs b/src/ui/Forms/Assa/SetPosition.cs
index 246e107f4..c2e508f11 100644
--- a/src/ui/Forms/Assa/SetPosition.cs
+++ b/src/ui/Forms/Assa/SetPosition.cs
@@ -40,7 +40,7 @@ namespace Nikse.SubtitleEdit.Forms.Assa
         private int _tempYScaled;
         private int _xScaled = -1;
         private int _yScaled = -1;
-        private double _currentPositionSeconds;
+        private readonly double _currentPositionSeconds;
 
         public SetPosition(Subtitle subtitle, int[] selectedIndices, string videoFileName, VideoInfo videoInfo, double currentPositionSeconds)
         {
diff --git a/src/ui/Forms/Assa/TagHistory.cs b/src/ui/Forms/Assa/TagHistory.cs
index 7489916c7..57ea49f63 100644
--- a/src/ui/Forms/Assa/TagHistory.cs
+++ b/src/ui/Forms/Assa/TagHistory.cs
@@ -1,4 +1,4 @@
-using System.Collections.Generic;
+ on using System.Collections.Generic;
 using System.Linq;
 using Nikse.SubtitleEdit.Core.Common;
 using Nikse.SubtitleEdit.Logic;
diff --git a/src/ui/Forms/Main.cs b/src/ui/Forms/Main.cs
index c6331de4b..6de5148b2 100644
--- a/src/ui/Forms/Main.cs
+++ b/src/ui/Forms/Main.cs
@@ -35194,6 +35194,11 @@ namespace Nikse.SubtitleEdit.Forms
 
         private void ApplyCustomStylesToolStripMenuItemClick(object sender, EventArgs e)
         {
+            if (GetCurrentSubtitleFormat().GetType() != typeof(AdvancedSubStationAlpha))
+            {
+                return;
+            }
+
             using (var form = new ApplyCustomStyles(_subtitle, SubtitleListview1.GetSelectedIndices()))
             {
                 if (form.ShowDialog(this) != DialogResult.OK)
@@ -35212,13 +35217,17 @@ namespace Nikse.SubtitleEdit.Forms
 
         private void SetPositionToolStripMenuItemClick(object sender, EventArgs e)
         {
+            if (GetCurrentSubtitleFormat().GetType() != typeof(AdvancedSubStationAlpha))
+            {
+                return;
+            }
+
             if (string.IsNullOrEmpty(_videoFileName))
             {
                 MessageBox.Show(LanguageSettings.Current.General.NoVideoLoaded);
                 return;
             }
 
-
             using (var form = new SetPosition(_subtitle, SubtitleListview1.GetSelectedIndices(), _videoFileName, _videoInfo, mediaPlayer.CurrentPosition))
             {
                 var result = form.ShowDialog(this);
@@ -35434,6 +35443,12 @@ namespace Nikse.SubtitleEdit.Forms
 
         private void ProgressBarToolStripMenuItemClick(object sender, EventArgs e)
         {
+            if (GetCurrentSubtitleFormat().GetType() != typeof(AdvancedSubStationAlpha))
+            {
+                return;
+            }
+
+
             if (string.IsNullOrEmpty(_videoFileName) || _videoInfo == null || _videoInfo.Width == 0 || _videoInfo.Height == 0)
             {
                 MessageBox.Show(LanguageSettings.Current.General.NoVideoLoaded);
@@ -35463,6 +35478,11 @@ namespace Nikse.SubtitleEdit.Forms
 
         private void ShowAssaResolutionChanger(bool showNeverButton)
         {
+            if (GetCurrentSubtitleFormat().GetType() != typeof(AdvancedSubStationAlpha))
+            {
+                return;
+            }
+
             using (var form = new ResolutionResampler(_subtitle, _videoFileName, _videoInfo, showNeverButton))
             {
                 var result = form.ShowDialog(this);