diff --git a/src/ui/Forms/AudioToText/WhisperAudioToText.cs b/src/ui/Forms/AudioToText/WhisperAudioToText.cs
index 5e4f04210..61ad8aafd 100644
--- a/src/ui/Forms/AudioToText/WhisperAudioToText.cs
+++ b/src/ui/Forms/AudioToText/WhisperAudioToText.cs
@@ -48,7 +48,6 @@ namespace Nikse.SubtitleEdit.Forms.AudioToText
         public bool IncompleteModel { get; set; }
         public string IncompleteModelName { get; set; }
 
-        private static bool? _cudaNoDevice { get; set; }
         private static bool? _cudaSomeDevice { get; set; }
 
         public Subtitle TranscribedSubtitle { get; private set; }
@@ -1752,16 +1751,12 @@ namespace Nikse.SubtitleEdit.Forms.AudioToText
 
         private static void OutputHandlerCheckCuda(object sendingProcess, DataReceivedEventArgs outLine)
         {
-            if (string.IsNullOrWhiteSpace(outLine.Data))
+            if (string.IsNullOrEmpty(outLine.Data))
             {
                 return;
             }
 
-            if (outLine.Data.Contains("CUDA device: 0"))
-            {
-                _cudaNoDevice = true;
-            }
-            else if (outLine.Data.Contains("CUDA device:"))
+            if (!outLine.Data.Contains("CUDA device: 0") && outLine.Data.Contains("CUDA device:"))
             {
                 _cudaSomeDevice = true;
             }
diff --git a/src/ui/Forms/BinaryEdit/BinEdit.cs b/src/ui/Forms/BinaryEdit/BinEdit.cs
index 1c0f7e8dd..0d9b41b46 100644
--- a/src/ui/Forms/BinaryEdit/BinEdit.cs
+++ b/src/ui/Forms/BinaryEdit/BinEdit.cs
@@ -429,8 +429,8 @@ namespace Nikse.SubtitleEdit.Forms.BinaryEdit
                 FillListView(_subtitle);
                 found = true;
             }
-            
-            
+
+
             if (!found && (ext == ".mkv" || ext == ".mks"))
             {
                 if (!OpenMatroskaFile(fileName))
@@ -550,7 +550,7 @@ namespace Nikse.SubtitleEdit.Forms.BinaryEdit
                     found = true;
                 }
             }
-            
+
             if (!found && FileUtil.IsManzanita(fileName))
             {
                 if (!ImportSubtitleFromManzanitaTransportStream(fileName))
@@ -2817,8 +2817,7 @@ $DROP=[DROPVALUE]" + Environment.NewLine + Environment.NewLine +
 
             if (!e.Cancel)
             {
-                e.Cancel = true;
-
+                e.Cancel = true; // Hack as FormClosing will crash if any Forms are created here (e.g. a msgbox). 
                 _forceClose = true;
                 _dialogResult = DialogResult;
                 SynchronizationContext.Current.Post(TimeSpan.FromMilliseconds(10), () =>
diff --git a/src/ui/Forms/Main.cs b/src/ui/Forms/Main.cs
index 632330c06..0b77f085e 100644
--- a/src/ui/Forms/Main.cs
+++ b/src/ui/Forms/Main.cs
@@ -13242,9 +13242,8 @@ namespace Nikse.SubtitleEdit.Forms
 
             if (!e.Cancel)
             {
-                e.Cancel = true;
+                e.Cancel = true; // Hack as FormClosing will crash if any Forms are created here (e.g. a msgbox). 
                 _forceClose = true;
-                // To allow windows in FormClosing...
                 SynchronizationContext.Current.Post(TimeSpan.FromMilliseconds(10), () => Application.Exit());
             }
         }
diff --git a/src/ui/Forms/Ocr/VobSubOcr.cs b/src/ui/Forms/Ocr/VobSubOcr.cs
index b2502c704..4ab00443d 100644
--- a/src/ui/Forms/Ocr/VobSubOcr.cs
+++ b/src/ui/Forms/Ocr/VobSubOcr.cs
@@ -8229,9 +8229,7 @@ namespace Nikse.SubtitleEdit.Forms.Ocr
 
             if (!e.Cancel)
             {
-                e.Cancel = true;
-
-                // To allow windows in FormClosing...
+                e.Cancel = true; // Hack as FormClosing will crash if any Forms are created here (e.g. a msgbox). 
                 _forceClose = true;
                 _dialogResult = DialogResult;
                 System.Threading.SynchronizationContext.Current.Post(TimeSpan.FromMilliseconds(10), () =>
diff --git a/src/ui/Forms/VisualSync.cs b/src/ui/Forms/VisualSync.cs
index 8d0535d30..5df161c6c 100644
--- a/src/ui/Forms/VisualSync.cs
+++ b/src/ui/Forms/VisualSync.cs
@@ -333,9 +333,7 @@ namespace Nikse.SubtitleEdit.Forms
 
             if (!e.Cancel)
             {
-                e.Cancel = true;
-
-                _forceClose = true;
+                e.Cancel = true; // Hack as FormClosing will crash if any Forms are created here (e.g. a msgbox). _forceClose = true;
                 _dialogResult = DialogResult;
                 System.Threading.SynchronizationContext.Current.Post(TimeSpan.FromMilliseconds(10), () =>
                 {