diff --git a/MainForm.cs b/MainForm.cs
index 1ddb62c..cd9b259 100644
--- a/MainForm.cs
+++ b/MainForm.cs
@@ -277,7 +277,16 @@ namespace FizzyLauncher
                 options.Converters.Add(new JsonPointConverter());
                 options.Converters.Add(new JsonSizeConverter());
 
-                this.CurrentSession = JsonSerializer.Deserialize<LauncherSession>(sourceCode, options);
+                try
+                {
+                    this.CurrentSession = JsonSerializer.Deserialize<LauncherSession>(sourceCode, options);
+                }
+                catch (Exception exc)
+                {
+                    MessageBox.Show("Unable to read session", "Load session");
+                    return;
+                }
+
                 if (this.CurrentSession == null)
                 {
                     this.CurrentSession = new LauncherSession();
@@ -361,9 +370,13 @@ namespace FizzyLauncher
                 this.CurrentSession.Groups.Add(container.Model);
             }
 
+            var options = new JsonSerializerOptions();
+            options.Converters.Add(new JsonPointConverter());
+            options.Converters.Add(new JsonSizeConverter());
+
             try
             {
-                File.WriteAllText(filename, JsonSerializer.Serialize(this.CurrentSession));
+                File.WriteAllText(filename, JsonSerializer.Serialize(this.CurrentSession, options));
 
                 if (showNotices)
                 {
diff --git a/Models/TileGroupModel.cs b/Models/TileGroupModel.cs
index cdf04a6..6f69481 100644
--- a/Models/TileGroupModel.cs
+++ b/Models/TileGroupModel.cs
@@ -1,14 +1,21 @@
-using System.Collections.Generic;
+using FizzyLauncher.Text.Json;
+using System.Collections.Generic;
 using System.Drawing;
+using System.Text.Json.Serialization;
 
 namespace FizzyLauncher.Models
 {
     public class TileGroupModel
     {
         public string Title { get; set; }
+
         public bool IsExpanded { get; set; } = false;
+
         public bool IsExclusive { get; set; } = false;
+
         public List<TileModel> Items { get; set; } = new List<TileModel>();
+
+        [JsonConverter(typeof(JsonSizeConverter))]
         public Size GridSize { get; set; } = new Size(0, 0);
     }
 }
\ No newline at end of file
diff --git a/Models/TileModel.cs b/Models/TileModel.cs
index 72f8411..9e47756 100644
--- a/Models/TileModel.cs
+++ b/Models/TileModel.cs
@@ -1,21 +1,31 @@
-using System;
+using FizzyLauncher.Text.Json;
+using System;
 using System.Collections.Generic;
 using System.Diagnostics;
 using System.Drawing;
+using System.Text.Json.Serialization;
 
 namespace FizzyLauncher.Models
 {
     public class TileModel
     {
         public string Title { get; set; }
+
         public string ProcessFilename { get; set; }
+
         public string ProcessArgument { get; set; }
+
         public string ProcessWorkingDirectory { get; set; }
+
         public ProcessWindowStyle ProcessWindowStyle { get; set; } = ProcessWindowStyle.Normal;
+
         public bool ProcessAsAdmin { get; set; } = false;
+
+        [JsonConverter(typeof(JsonPointConverter))]
         public Point Position { get; set; }
 
         public bool IsGroup { get; set; } = false;
+
         public List<TileModel> Items { get; set; } = new List<TileModel>();
 
         public override string ToString() => this.Title ?? string.Empty;