diff --git a/HellionChat/Message.cs b/HellionChat/Message.cs
index 2d7420a..804747e 100755
--- a/HellionChat/Message.cs
+++ b/HellionChat/Message.cs
@@ -49,7 +49,10 @@ public partial class Message
         ExtraChatChannel = extraChatChannel;
         Hash = GenerateHash();
 
-        foreach (var chunk in sender.Concat(content))
+        // Iterate the processed Content list (returned by CheckMessageContent)
+        // rather than the raw constructor parameter — chunks added or replaced
+        // by CheckMessageContent must also have their back-reference set.
+        foreach (var chunk in Sender.Concat(Content))
             chunk.Message = this;
     }
 
diff --git a/HellionChat/Sheets.cs b/HellionChat/Sheets.cs
index 3332f27..c65394e 100644
--- a/HellionChat/Sheets.cs
+++ b/HellionChat/Sheets.cs
@@ -37,7 +37,7 @@ public static class Sheets
 
     public static IEnumerable<World> WorldsOnDatacenter(IPlayerCharacter character)
     {
-        var dcRow = character.HomeWorld.Value.DataCenter.Value.Region.RowId;
-        return WorldSheet.Where(world => world.IsPublic && world.DataCenter.Value.Region.RowId == dcRow);
+        var dcRow = character.HomeWorld.Value.DataCenter.RowId;
+        return WorldSheet.Where(world => world.IsPublic && world.DataCenter.RowId == dcRow);
     }
 }
\ No newline at end of file
diff --git a/HellionChat/Util/GlobalParametersCache.cs b/HellionChat/Util/GlobalParametersCache.cs
index c4cbe11..adfba4a 100644
--- a/HellionChat/Util/GlobalParametersCache.cs
+++ b/HellionChat/Util/GlobalParametersCache.cs
@@ -10,10 +10,14 @@ public static class GlobalParametersCache
 
     public static int GetValue(int index)
     {
-        if (index < 0 || index >= Cache.Length)
+        // Capture the array reference once so the bounds check and the
+        // indexed read operate on the same instance, even if Refresh
+        // reassigns Cache between the two operations.
+        var cache = Cache;
+        if (index < 0 || index >= cache.Length)
             return 0;
 
-        return Cache[index];
+        return cache[index];
     }
 
     /// <summary>
diff --git a/HellionChat/Util/IconUtil.cs b/HellionChat/Util/IconUtil.cs
index 2821564..7697d41 100755
--- a/HellionChat/Util/IconUtil.cs
+++ b/HellionChat/Util/IconUtil.cs
@@ -59,8 +59,14 @@ public readonly unsafe ref struct GfdFileView
             return false;
         }
 
+        if (entries.Length == 0)
+        {
+            entry = default;
+            return false;
+        }
+
         var lo = 0;
-        var hi = entries.Length;
+        var hi = entries.Length - 1;
         while (lo <= hi)
         {
             var i = lo + ((hi - lo) >> 1);
@@ -70,7 +76,7 @@ public readonly unsafe ref struct GfdFileView
                 {
                     iconId = entries[i].Redirect;
                     lo = 0;
-                    hi = entries.Length;
+                    hi = entries.Length - 1;
                     continue;
                 }