diff --git a/Assets/FlashTools/Examples/Scenes/Scene00.unity b/Assets/FlashTools/Examples/Scenes/Scene00.unity
index 3619cf5..b7abfa0 100644
--- a/Assets/FlashTools/Examples/Scenes/Scene00.unity
+++ b/Assets/FlashTools/Examples/Scenes/Scene00.unity
@@ -145,7 +145,7 @@ Camera:
   far clip plane: 1000
   field of view: 60
   orthographic: 1
-  orthographic size: 3
+  orthographic size: 4
   m_Depth: 0
   m_CullingMask:
     serializedVersion: 2
diff --git a/Assets/FlashTools/Resources/SwfConverterSettings.asset b/Assets/FlashTools/Resources/SwfConverterSettings.asset
index 76174a4..ed8c61a 100644
--- a/Assets/FlashTools/Resources/SwfConverterSettings.asset
+++ b/Assets/FlashTools/Resources/SwfConverterSettings.asset
@@ -15,7 +15,8 @@ MonoBehaviour:
     MaxAtlasSize: 1024
     AtlasPadding: 1
     PixelsPerUnit: 100
-    AtlasPowerOfTwo: 0
     GenerateMipMaps: 1
+    AtlasPowerOfTwo: 1
+    AtlasForceSquare: 0
     AtlasFilterMode: 1
     AtlasImporterFormat: -3
diff --git a/Assets/FlashTools/Resources/SwfConverterSettings.asset.meta b/Assets/FlashTools/Resources/SwfConverterSettings.asset.meta
index 659fed8..ccf92cf 100644
--- a/Assets/FlashTools/Resources/SwfConverterSettings.asset.meta
+++ b/Assets/FlashTools/Resources/SwfConverterSettings.asset.meta
@@ -1,6 +1,6 @@
 fileFormatVersion: 2
 guid: cda4fb87dc8624946bdaed871b60f0b8
-timeCreated: 1471847086
+timeCreated: 1471880348
 licenseType: Free
 NativeFormatImporter:
   userData: 
diff --git a/Assets/FlashTools/Scripts/Internal/Editor/SwfAnimationAssetEditor.cs b/Assets/FlashTools/Scripts/Internal/Editor/SwfAnimationAssetEditor.cs
index f267a82..025eb9e 100644
--- a/Assets/FlashTools/Scripts/Internal/Editor/SwfAnimationAssetEditor.cs
+++ b/Assets/FlashTools/Scripts/Internal/Editor/SwfAnimationAssetEditor.cs
@@ -22,9 +22,16 @@ namespace FlashTools.Internal {
 
 		void ApplyOverriddenSettings() {
 			if ( _asset ) {
-				_asset.Settings = _asset.Overridden;
+				if ( File.Exists(GetSwfPath()) ) {
+					_asset.Settings = _asset.Overridden;
+					ReconvertAnimation();
+				} else {
+					Debug.LogErrorFormat(
+						"Swf source for animation not found: '{0}'",
+						GetSwfPath());
+					RevertOverriddenSettings();
+				}
 			}
-			ReconvertAnimation();
 		}
 
 		void ReconvertAnimation() {
@@ -76,7 +83,7 @@ namespace FlashTools.Internal {
 						prefab,
 						ReplacePrefabOptions.ConnectToPrefab);
 				}
-				DestroyImmediate(anim_go);
+				GameObject.DestroyImmediate(anim_go, true);
 			}
 		}
 
diff --git a/Assets/FlashTools/Scripts/Internal/Editor/SwfPostprocessor.cs b/Assets/FlashTools/Scripts/Internal/Editor/SwfPostprocessor.cs
index f51130c..8007582 100644
--- a/Assets/FlashTools/Scripts/Internal/Editor/SwfPostprocessor.cs
+++ b/Assets/FlashTools/Scripts/Internal/Editor/SwfPostprocessor.cs
@@ -184,11 +184,41 @@ namespace FlashTools.Internal {
 				.Select (p => LoadTextureFromBitmapDefine(p.Value))
 				.ToArray();
 
-			var atlas = new Texture2D(0, 0, TextureFormat.ARGB32, false);
+			var atlas_padding  = Mathf.Max(0, asset.Settings.AtlasPadding);
+			var max_atlas_size = (asset.Settings.AtlasPowerOfTwo && !Mathf.IsPowerOfTwo(asset.Settings.MaxAtlasSize))
+				? Mathf.NextPowerOfTwo(asset.Settings.MaxAtlasSize)
+				: asset.Settings.MaxAtlasSize;
+
+			var atlas = new Texture2D(0, 0);
 			var atlas_rects = atlas.PackTextures(
 				textures,
-				asset.Settings.AtlasPadding,
-				asset.Settings.MaxAtlasSize);
+				atlas_padding,
+				Mathf.Max(32, max_atlas_size));
+
+			if ( asset.Settings.AtlasForceSquare && atlas.width != atlas.height ) {
+				var atlas_size   = Mathf.Max(atlas.width, atlas.height);
+				var new_atlas    = new Texture2D(atlas_size, atlas_size, TextureFormat.ARGB32, false);
+				for ( var i = 0; i < atlas_rects.Length; ++i ) {
+					var new_position = atlas_rects[i].position;
+					new_position.x *= (float)(atlas.width )/atlas_size;
+					new_position.y *= (float)(atlas.height)/atlas_size;
+
+					var new_size = atlas_rects[i].size;
+					new_size.x *= (float)(atlas.width )/atlas_size;
+					new_size.y *= (float)(atlas.height)/atlas_size;
+
+					atlas_rects[i] = new Rect(new_position, new_size);
+				}
+				var empty_pixels = new Color32[atlas_size * atlas_size];
+				for ( var i = 0; i < atlas_size * atlas_size; ++i ) {
+					empty_pixels[i] = new Color(1,1,1,0);
+				}
+				new_atlas.SetPixels32(empty_pixels);
+				new_atlas.SetPixels32(0, 0, atlas.width, atlas.height, atlas.GetPixels32());
+				new_atlas.Apply();
+				GameObject.DestroyImmediate(atlas, true);
+				atlas = new_atlas;
+			}
 
 			File.WriteAllBytes(
 				GetAtlasPath(swf_asset),
diff --git a/Assets/FlashTools/Scripts/SwfConverterSettings.cs b/Assets/FlashTools/Scripts/SwfConverterSettings.cs
index 1d7c53f..b67ffce 100644
--- a/Assets/FlashTools/Scripts/SwfConverterSettings.cs
+++ b/Assets/FlashTools/Scripts/SwfConverterSettings.cs
@@ -12,19 +12,21 @@ namespace FlashTools {
 			public int                   MaxAtlasSize;
 			public int                   AtlasPadding;
 			public int                   PixelsPerUnit;
-			public bool                  AtlasPowerOfTwo;
 			public bool                  GenerateMipMaps;
+			public bool                  AtlasPowerOfTwo;
+			public bool                  AtlasForceSquare; //TODO: implme
 			public FilterMode            AtlasFilterMode;
 			public TextureImporterFormat AtlasImporterFormat;
 
 			public bool Equal(Settings other) {
 				return
-					MaxAtlasSize        == other.MaxAtlasSize    &&
-					AtlasPadding        == other.AtlasPadding    &&
-					PixelsPerUnit       == other.PixelsPerUnit   &&
-					AtlasPowerOfTwo     == other.AtlasPowerOfTwo &&
-					GenerateMipMaps     == other.GenerateMipMaps &&
-					AtlasFilterMode     == other.AtlasFilterMode &&
+					MaxAtlasSize        == other.MaxAtlasSize     &&
+					AtlasPadding        == other.AtlasPadding     &&
+					PixelsPerUnit       == other.PixelsPerUnit    &&
+					GenerateMipMaps     == other.GenerateMipMaps  &&
+					AtlasPowerOfTwo     == other.AtlasPowerOfTwo  &&
+					AtlasForceSquare    == other.AtlasForceSquare &&
+					AtlasFilterMode     == other.AtlasFilterMode  &&
 					AtlasImporterFormat == other.AtlasImporterFormat;
 			}
 
@@ -34,8 +36,9 @@ namespace FlashTools {
 						MaxAtlasSize        = 1024,
 						AtlasPadding        = 1,
 						PixelsPerUnit       = 100,
-						AtlasPowerOfTwo     = false,
 						GenerateMipMaps     = true,
+						AtlasPowerOfTwo     = true,
+						AtlasForceSquare    = false,
 						AtlasFilterMode     = FilterMode.Bilinear,
 						AtlasImporterFormat = TextureImporterFormat.AutomaticTruecolor};
 				}