diff --git a/doomsday/client/include/world/sky.h b/doomsday/client/include/world/sky.h
index 9a55adbda6..439cb0c18e 100644
--- a/doomsday/client/include/world/sky.h
+++ b/doomsday/client/include/world/sky.h
@@ -32,8 +32,7 @@
 #include "Material"
 #include "ModelDef"
 
-#define DEFAULT_SKY_HORIZON_OFFSET       ( 0 )
-#define DEFAULT_SKY_SPHERE_MATERIAL      ( "Textures:SKY1" )
+#define DEFAULT_SKY_SPHERE_MATERIAL ( "Textures:SKY1" )
 
 /**
  * Behavior logic for a sky in the world system.
diff --git a/doomsday/libdoomsday/include/doomsday/defs/sky.h b/doomsday/libdoomsday/include/doomsday/defs/sky.h
index 749fe63b02..d21016c0b9 100644
--- a/doomsday/libdoomsday/include/doomsday/defs/sky.h
+++ b/doomsday/libdoomsday/include/doomsday/defs/sky.h
@@ -32,6 +32,7 @@ namespace defn {
 #define SLF_MASK            0x2  ///< @c true= mask the layer.
 
 #define DEFAULT_SKY_HEIGHT               ( .666667f )
+#define DEFAULT_SKY_HORIZON_OFFSET       ( -0.105f )
 #define DEFAULT_SKY_SPHERE_XOFFSET       ( 0 )
 #define DEFAULT_SKY_SPHERE_FADEOUT_LIMIT ( .3f )
 
diff --git a/doomsday/libdoomsday/src/defs/dedfile.cpp b/doomsday/libdoomsday/src/defs/dedfile.cpp
index c57d7994a7..999b1370be 100644
--- a/doomsday/libdoomsday/src/defs/dedfile.cpp
+++ b/doomsday/libdoomsday/src/defs/dedfile.cpp
@@ -115,10 +115,14 @@ int DED_Read(ded_t *ded, String path)
         hndl->rewind();
         char *bufferedDef = (char *) M_Calloc(bufferedDefSize + 1);
 
+        File1 &file = hndl->file();
+        /// @todo Custom status for contained files is not inherited from the container?
+        bool const isCustom = (file.isContained()? file.container().hasCustom() : file.hasCustom());
+
         // Copy the file into the local buffer and parse definitions.
         hndl->read((uint8_t *)bufferedDef, bufferedDefSize);
-        int result = DED_ReadData(ded, bufferedDef, path, hndl->file().hasCustom());
-        App_FileSystem().releaseFile(hndl->file());
+        int result = DED_ReadData(ded, bufferedDef, path, isCustom);
+        App_FileSystem().releaseFile(file);
 
         // Done. Release temporary storage and return the result.
         M_Free(bufferedDef);
diff --git a/doomsday/libdoomsday/src/defs/dedparser.cpp b/doomsday/libdoomsday/src/defs/dedparser.cpp
index a1824877b8..0131791e75 100644
--- a/doomsday/libdoomsday/src/defs/dedparser.cpp
+++ b/doomsday/libdoomsday/src/defs/dedparser.cpp
@@ -1997,7 +1997,7 @@ DENG2_PIMPL(DEDParser)
 
                         if(testCustom)
                         {
-                            if(mi->getb("custom") != negate)
+                            if(mi->getb("custom") != !negate)
                             {
                                 mi = nullptr; // skip
                             }
diff --git a/doomsday/libdoomsday/src/defs/sky.cpp b/doomsday/libdoomsday/src/defs/sky.cpp
index 4f42561784..a4f603f6a9 100644
--- a/doomsday/libdoomsday/src/defs/sky.cpp
+++ b/doomsday/libdoomsday/src/defs/sky.cpp
@@ -34,7 +34,7 @@ void Sky::resetToDefaults()
     def().addText  ("id", "");
     def().addNumber("flags", 0);
     def().addNumber("height", DEFAULT_SKY_HEIGHT);
-    def().addNumber("horizonOffset", 0);
+    def().addNumber("horizonOffset", DEFAULT_SKY_HORIZON_OFFSET);
     def().addArray ("color", new ArrayValue(Vector3f()));
     def().addArray ("layer", new ArrayValue);
     def().addArray ("model", new ArrayValue);