diff --git a/BizHawk.Client.Common/movie/tasproj/TasMovie.Editing.cs b/BizHawk.Client.Common/movie/tasproj/TasMovie.Editing.cs
index 541165ecb6..bead4dccb7 100644
--- a/BizHawk.Client.Common/movie/tasproj/TasMovie.Editing.cs
+++ b/BizHawk.Client.Common/movie/tasproj/TasMovie.Editing.cs
@@ -29,8 +29,17 @@ namespace BizHawk.Client.Common
 		{
 			base.Truncate(frame);
 
-			LagLog.RemoveRange(frame + 2, LagLog.Count - frame - 1);
+			if (frame < LagLog.Count)
+			{
+				LagLog.RemoveRange(frame + 2, LagLog.Count - frame - 1);
+			}
+
 			StateManager.Invalidate(frame + 1);
+
+			if (frame < _log.Count - 1)
+			{
+				Changes = true;
+			}
 			// TODO: Markers? What does taseditor do?
 		}
 
diff --git a/BizHawk.Client.EmuHawk/tools/TAStudio/TAStudio.Designer.cs b/BizHawk.Client.EmuHawk/tools/TAStudio/TAStudio.Designer.cs
index 46da547f2d..86c3639077 100644
--- a/BizHawk.Client.EmuHawk/tools/TAStudio/TAStudio.Designer.cs
+++ b/BizHawk.Client.EmuHawk/tools/TAStudio/TAStudio.Designer.cs
@@ -407,10 +407,10 @@ namespace BizHawk.Client.EmuHawk
 			// 
 			// TruncateMenuItem
 			// 
-			this.TruncateMenuItem.Enabled = false;
 			this.TruncateMenuItem.Name = "TruncateMenuItem";
 			this.TruncateMenuItem.Size = new System.Drawing.Size(240, 22);
 			this.TruncateMenuItem.Text = "&Truncate Movie";
+			this.TruncateMenuItem.Click += new System.EventHandler(this.TruncateMenuItem_Click);
 			// 
 			// ConfigSubMenu
 			// 
diff --git a/BizHawk.Client.EmuHawk/tools/TAStudio/TAStudio.cs b/BizHawk.Client.EmuHawk/tools/TAStudio/TAStudio.cs
index 99e2ae179b..c4cb00a7c2 100644
--- a/BizHawk.Client.EmuHawk/tools/TAStudio/TAStudio.cs
+++ b/BizHawk.Client.EmuHawk/tools/TAStudio/TAStudio.cs
@@ -1,5 +1,4 @@
 using System;
-using System.Collections;
 using System.Collections.Generic;
 using System.Drawing;
 using System.IO;
@@ -55,7 +54,7 @@ namespace BizHawk.Client.EmuHawk
 			}
 		}
 
-		private IEnumerable SelectedIndices
+		private IEnumerable<int> SelectedIndices
 		{
 			get
 			{
@@ -461,9 +460,7 @@ namespace BizHawk.Client.EmuHawk
 		private void CutMenuItem_Click(object sender, EventArgs e)
 		{
 			_tasClipboard.Clear();
-			var list = TasView.SelectedIndices
-				.OfType<int>()
-				.ToArray();
+			var list = SelectedIndices.ToArray();
 			var sb = new StringBuilder();
 			for (var i = 0; i < list.Length; i++)
 			{
@@ -485,10 +482,7 @@ namespace BizHawk.Client.EmuHawk
 
 		private void ClearMenuItem_Click(object sender, EventArgs e)
 		{
-			var list = TasView.SelectedIndices
-				.OfType<int>();
-
-			foreach (var frame in list)
+			foreach (var frame in SelectedIndices)
 			{
 				_tas.ClearFrame(frame);
 			}
@@ -499,12 +493,7 @@ namespace BizHawk.Client.EmuHawk
 		private void DeleteFramesMenuItem_Click(object sender, EventArgs e)
 		{
 			_tasClipboard.Clear();
-			var list = TasView.SelectedIndices
-				.OfType<int>()
-				.ToArray();
-
-			_tas.RemoveFrames(list);
-
+			_tas.RemoveFrames(SelectedIndices.ToArray());
 			SetSplicer();
 			TasView.DeselectAll();
 			RefreshDialog();
@@ -512,14 +501,10 @@ namespace BizHawk.Client.EmuHawk
 
 		private void CloneMenuItem_Click(object sender, EventArgs e)
 		{
-			var framesToInsert = TasView.SelectedIndices
-				.OfType<int>()
-				.OrderBy(frame => frame)
-				.ToList();
-
-			var insertionFrame = framesToInsert.Last() + 1;
-
+			var framesToInsert = SelectedIndices.ToList();
+			var insertionFrame = LastSelectedIndex + 1;
 			var inputLog = new List<string>();
+
 			foreach (var frame in framesToInsert)
 			{
 				inputLog.Add(_tas.GetInput(frame));
@@ -532,15 +517,17 @@ namespace BizHawk.Client.EmuHawk
 
 		private void InsertFrameMenuItem_Click(object sender, EventArgs e)
 		{
-			var insertionFrame = TasView.SelectedIndices
-				.OfType<int>()
-				.Last() + 1;
-
-			_tas.InsertEmptyFrame(insertionFrame);
-
+			_tas.InsertEmptyFrame(LastSelectedIndex + 1);
 			RefreshDialog();
 		}
 
+		private void TruncateMenuItem_Click(object sender, EventArgs e)
+		{
+			_tas.Truncate(LastSelectedIndex + 1);
+			RefreshDialog();
+		}
+
+
 		#endregion
 
 		#region Config