diff --git a/Build/Configurations/Includes/Eternity_common.cfg b/Build/Configurations/Includes/Eternity_common.cfg
index 6e6419fccff00f006d3cb367a9b0e483d3525d7b..cc6be86109d4aa811307f92c0394551a4493f57c 100755
--- a/Build/Configurations/Includes/Eternity_common.cfg
+++ b/Build/Configurations/Includes/Eternity_common.cfg
@@ -278,6 +278,34 @@ mapformat_udmf
 		include("Eternity_misc.cfg", "sectorflags_udmf");
 	}
 	
+	// Sector portal flags (ceiling)
+	ceilingportalflags
+	{
+		portal_ceil_disabled = "Disabled";
+		portal_ceil_blocksound = "Block sound";
+		portal_ceil_nopass = "Impassable";
+		portal_ceil_norender = "Not rendered";
+		portal_ceil_attached = "Attach to linked portal";
+	}
+	
+	// Sector portal flags (floor)
+	floorportalflags
+	{
+		portal_floor_disabled = "Disabled";
+		portal_floor_blocksound = "Block sound";
+		portal_floor_nopass = "Impassable";
+		portal_floor_norender = "Not rendered";
+		portal_floor_attached = "Attach to linked portal";
+	}
+	
+	// Sector portal renderstyles
+	sectorportalrenderstyles
+	{
+		none = "None";
+		translucent = "Translucent";
+		additive = "Additive";
+	}	
+	
 	// DEFAULT SECTOR BRIGHTNESS LEVELS
 	sectorbrightness
 	{
diff --git a/Source/Core/Windows/SectorEditFormUDMF.cs b/Source/Core/Windows/SectorEditFormUDMF.cs
index 4b2cc13da7fb16c1edba4132e5ab7398c6c511dd..6bf41480b7d775065211c03eae4c7dc7e0cd5f6b 100755
--- a/Source/Core/Windows/SectorEditFormUDMF.cs
+++ b/Source/Core/Windows/SectorEditFormUDMF.cs
@@ -395,8 +395,11 @@ namespace CodeImp.DoomBuilder.Windows
 			floorRenderStyle.SelectedIndex = renderstyles.IndexOf(sc.Fields.GetValue("renderstylefloor", "translucent"));
 
 			// Portal render style
-			ceilportalrenderstyle.SelectedIndex = portalrenderstyles.IndexOf(sc.Fields.GetValue("portal_ceil_overlaytype", "translucent"));
-			floorportalrenderstyle.SelectedIndex = portalrenderstyles.IndexOf(sc.Fields.GetValue("portal_floor_overlaytype", "translucent"));
+			if (portalrenderstyles.Count > 0)
+			{
+				ceilportalrenderstyle.SelectedIndex = portalrenderstyles.IndexOf(sc.Fields.GetValue("portal_ceil_overlaytype", portalrenderstyles[0]));
+				floorportalrenderstyle.SelectedIndex = portalrenderstyles.IndexOf(sc.Fields.GetValue("portal_floor_overlaytype", portalrenderstyles[0]));
+			}
 
 			// Damage
 			damagetype.Text = sc.Fields.GetValue("damagetype", NO_DAMAGETYPE);
@@ -530,9 +533,9 @@ namespace CodeImp.DoomBuilder.Windows
 					floorRenderStyle.SelectedIndex = -1;
 
 				// Portal render style
-				if(ceilportalrenderstyle.SelectedIndex > -1 && ceilportalrenderstyle.SelectedIndex != portalrenderstyles.IndexOf(s.Fields.GetValue("portal_ceil_overlaytype", "translucent")))
+				if(ceilportalrenderstyle.SelectedIndex > -1 && ceilportalrenderstyle.SelectedIndex != portalrenderstyles.IndexOf(s.Fields.GetValue("portal_ceil_overlaytype", portalrenderstyles[0])))
 					ceilportalrenderstyle.SelectedIndex = -1;
-				if(floorportalrenderstyle.SelectedIndex > -1 && floorportalrenderstyle.SelectedIndex != portalrenderstyles.IndexOf(s.Fields.GetValue("portal_floor_overlaytype", "translucent")))
+				if(floorportalrenderstyle.SelectedIndex > -1 && floorportalrenderstyle.SelectedIndex != portalrenderstyles.IndexOf(s.Fields.GetValue("portal_floor_overlaytype", portalrenderstyles[0])))
 					floorportalrenderstyle.SelectedIndex = -1;
 
 				// Damage
@@ -873,9 +876,9 @@ namespace CodeImp.DoomBuilder.Windows
 				if(portalrenderstyles.Count > 0)
 				{
 					if(ceilportalrenderstyle.SelectedIndex > -1)
-						UniFields.SetString(s.Fields, "portal_ceil_overlaytype", portalrenderstyles[ceilportalrenderstyle.SelectedIndex], "translucent");
+						UniFields.SetString(s.Fields, "portal_ceil_overlaytype", portalrenderstyles[ceilportalrenderstyle.SelectedIndex], portalrenderstyles[0]);
 					if(floorportalrenderstyle.SelectedIndex > -1)
-						UniFields.SetString(s.Fields, "portal_floor_overlaytype", portalrenderstyles[floorportalrenderstyle.SelectedIndex], "translucent");
+						UniFields.SetString(s.Fields, "portal_floor_overlaytype", portalrenderstyles[floorportalrenderstyle.SelectedIndex], portalrenderstyles[0]);
 				}
 
 				//Damage