diff --git a/__init__.py b/__init__.py
index 088747d..dba41cf 100644
--- a/__init__.py
+++ b/__init__.py
@@ -29,7 +29,7 @@
 bl_info = {
     "name": "CharMorph",
     "author": "Michael Vigovsky",
-    "version": (0, 2, 9),
+    "version": (0, 3, 0),
     "blender": (2, 83, 0),
     "location": "View3D > Tools > CharMorph",
     "description": "Character creation and morphing, cloth fitting and rigging tools",
diff --git a/cmedit/__init__.py b/cmedit/__init__.py
index b311f4e..05099a3 100644
--- a/cmedit/__init__.py
+++ b/cmedit/__init__.py
@@ -361,12 +361,16 @@ def normalize(v):
                 continue
             v2 = counterpart_vertex(mesh.vertices, kd, v)
             if v2 is None:
+                print("no counterpart", v.index)
                 continue
             gdict = {obj.vertex_groups[g.group].name: g for g in v2.groups}
 
             wgt2 = 0
             #cleanup groups without counterparts before normalizing
             for g in v.groups:
+                if g.group > len(obj.vertex_groups) or g.group < 0:
+                    print("bad vg id", v.index, g.group)
+                    continue
                 vg = obj.vertex_groups[g.group]
                 g2e = gdict.get(swap_l_r(vg.name))
                 if g2e:
@@ -400,8 +404,8 @@ def normalize(v):
                     return {"FINISHED"}
 
                 if abs(g1e.weight-g2w) >= 0.00001:
-                    if not is_deform(g2name):
-                        print("Normalizing non-deform", v.index, v2.index, g2name)
+                    #if not is_deform(g2name):
+                    #    print("Normalizing non-deform", v.index, v2.index, g2name)
                     #print("Normalizing", v.index, v2.index, g1e.weight, g2w, wgt2, g2name)
                     if v2.select:
                         wgt = (g1e.weight+g2w)/2
diff --git a/cmedit/file_io.py b/cmedit/file_io.py
index 720c1ba..a9b0081 100644
--- a/cmedit/file_io.py
+++ b/cmedit/file_io.py
@@ -109,6 +109,9 @@ def execute(self, context):
 def float_dtype(context):
     return numpy.float64 if context.window_manager.cmedit_ui.morph_float_precicion == "64" else numpy.float32
 
+def flatten(arr, dtype):
+    return numpy.block([numpy.array(item, dtype=dtype) for item in arr])
+
 class OpVgExport(bpy.types.Operator, bpy_extras.io_utils.ExportHelper):
     bl_idname = "cmedit.vg_export"
     bl_label = "Export VGs"
@@ -129,8 +132,8 @@ def execute(self, context):
         numpy.savez_compressed(self.filepath,
             names=b'\0'.join(name.encode("utf-8") for name in names),
             cnt=numpy.array(cnt, dtype=numpy.uint16 if max(cnt) > 255 else numpy.uint8),
-            idx=numpy.array(idx, dtype=numpy.uint16),
-            weights=numpy.array(weights, dtype = float_dtype(context))
+            idx=flatten(idx, numpy.uint16),
+            weights=flatten(weights, float_dtype(context))
         )
 
         return {"FINISHED"}
diff --git a/data b/data
index 6e7dd22..4a87f25 160000
--- a/data
+++ b/data
@@ -1 +1 @@
-Subproject commit 6e7dd22647bd824731d98265546591c0087f496a
+Subproject commit 4a87f25213551be080b24182ba36aecebadfe6be