diff --git a/src/RhinoInside.Revit.GH/Types/ObjectStyles/Category.cs b/src/RhinoInside.Revit.GH/Types/ObjectStyles/Category.cs
index e22163aea..be65cf0a1 100644
--- a/src/RhinoInside.Revit.GH/Types/ObjectStyles/Category.cs
+++ b/src/RhinoInside.Revit.GH/Types/ObjectStyles/Category.cs
@@ -503,7 +503,7 @@ internal ModelContent ToModelContent(IDictionary<ARDB.ElementId, ModelContent> i
 
         // Material
         {
-          attributes.Material = Material?.ToModelContent(idMap) as ModelRenderMaterial ?? ModelRenderMaterial.Unset;
+          attributes.Material = Material?.ToModelContent(idMap) as ModelRenderMaterial;
         }
 
         // Some hardcoded tweaks…
diff --git a/src/RhinoInside.Revit/Rhinoceros.cs b/src/RhinoInside.Revit/Rhinoceros.cs
index 595da1f70..40aceffba 100755
--- a/src/RhinoInside.Revit/Rhinoceros.cs
+++ b/src/RhinoInside.Revit/Rhinoceros.cs
@@ -40,6 +40,10 @@ internal static bool InitEto(Assembly assembly)
       if (Eto.Forms.Application.Instance is null)
         new Eto.Forms.Application(Eto.Platforms.Wpf).Attach();
 
+#if RHINO_8
+      Eto.Wpf.Forms.Controls.TextBoxHandler.EnableNoGCRegionDefault = false;
+#endif
+
       return true;
     }
 
@@ -244,7 +248,7 @@ internal static bool Run()
 
       return active;
     }
-    #endregion
+#endregion
 
     #region Guests
     class GuestInfo