diff --git a/ILSpy/Commands/PdbGenerator.cs b/ILSpy/Commands/PdbGenerator.cs
index 3bdec887b..2a75b5967 100644
--- a/ILSpy/Commands/PdbGenerator.cs
+++ b/ILSpy/Commands/PdbGenerator.cs
@@ -99,8 +99,15 @@ namespace ILSpy.Commands
 			if (string.IsNullOrEmpty(folder))
 				return;
 
+			// GeneratingPortablePDB is a "...for {0}..." format string; fill the placeholder with the
+			// single assembly's name, or a count when several were selected, so the tab title isn't a
+			// literal "{0}".
+			string title = supported.Count == 1
+				? string.Format(Resources.GeneratingPortablePDB, supported.Keys.First().ShortName)
+				: string.Format(Resources.GeneratingPortablePDB, supported.Count + " assemblies");
+
 			// Run in a dedicated frozen tab so browsing the tree while PDBs generate can't cancel it.
-			await dockWorkspace.RunInNewTabAsync(Resources.GeneratingPortablePDB, token => Task.Run(() => {
+			await dockWorkspace.RunInNewTabAsync(title, token => Task.Run(() => {
 				var output = new AvaloniaEditTextOutput { Title = "Generate Portable PDB" };
 				var totalWatch = Stopwatch.StartNew();
 				foreach (var (assembly, file) in supported)
@@ -129,6 +136,7 @@ namespace ILSpy.Commands
 					{
 						output.Write(string.Format(Resources.GenerationFailedForAssembly, assembly.FileName, ex.Message));
 						output.WriteLine();
+						output.WriteExceptionDetails(ex);
 					}
 				}
 				totalWatch.Stop();
diff --git a/ILSpy/SmartTextOutputExtensions.cs b/ILSpy/SmartTextOutputExtensions.cs
index 8bce49d7e..50ef8f96e 100644
--- a/ILSpy/SmartTextOutputExtensions.cs
+++ b/ILSpy/SmartTextOutputExtensions.cs
@@ -25,6 +25,7 @@ using Avalonia.Interactivity;
 using Avalonia.Layout;
 using Avalonia.Media;
 
+using ICSharpCode.Decompiler;
 using ICSharpCode.ILSpy.Properties;
 
 using ILSpy.TextView;
@@ -34,6 +35,34 @@ namespace ILSpy
 {
 	public static class SmartTextOutputExtensions
 	{
+		/// <summary>
+		/// Writes the full exception (type, message, stack trace, inner exceptions) inside a
+		/// default-collapsed "Exception details" fold. Callers write their own header line first; this
+		/// keeps a failure report scannable while leaving the trace one click away when a failure is not
+		/// self-explanatory.
+		/// </summary>
+		public static void WriteExceptionDetails(this ITextOutput output, Exception ex)
+		{
+			ArgumentNullException.ThrowIfNull(output);
+			ArgumentNullException.ThrowIfNull(ex);
+			// Blank line between the caller's header and the fold so the collapsed "Exception details"
+			// marker is visually separated from the message above it.
+			output.WriteLine();
+			output.MarkFoldStart("Exception details", true);
+			// The fold span is counted in WriteLine() calls, not in the '\n' characters embedded in a
+			// single Write(). Emit the trace one line per WriteLine() so the fold genuinely spans
+			// multiple lines; otherwise it collapses to a single line and is dropped as noise.
+			var lines = ex.ToString().Split('\n');
+			for (int i = 0; i < lines.Length; i++)
+			{
+				if (i > 0)
+					output.WriteLine();
+				output.Write(lines[i].TrimEnd('\r'));
+			}
+			output.MarkFoldEnd();
+			output.WriteLine();
+		}
+
 		/// <summary>
 		/// Appends the standard "Open Explorer" result button that opens <paramref name="folder"/> in
 		/// the OS file manager, followed by a blank line. Shared tail of the export / save / PDB outputs.
diff --git a/ILSpy/TreeNodes/AssemblyTreeNode.cs b/ILSpy/TreeNodes/AssemblyTreeNode.cs
index 666d9fb2b..d617cfb93 100644
--- a/ILSpy/TreeNodes/AssemblyTreeNode.cs
+++ b/ILSpy/TreeNodes/AssemblyTreeNode.cs
@@ -468,9 +468,7 @@ namespace ILSpy.TreeNodes
 			{
 				language.WriteCommentLine(output, message);
 				output.WriteLine();
-				output.MarkFoldStart("Exception details", true);
-				output.Write(ex.ToString());
-				output.MarkFoldEnd();
+				output.WriteExceptionDetails(ex);
 			}
 
 			try