The Atomic Blender panel is loaded correctly when a blend file is loaded.

Blendphys.

io_mesh_pdb/__init__.py

@@ -75,6 +75,11 @@ class CLASS_atom_pdb_panel(Panel):
 
     def draw(self, context):
         layout = self.layout
+
+        # This is for the case that a blend file is loaded. 
+        if len(context.scene.atom_pdb) == 0:
+            bpy.context.scene.atom_pdb.add()
+
         scn    = context.scene.atom_pdb[0]
 
         row = layout.row()

io_mesh_pdb/export_pdb.py

@@ -25,7 +25,7 @@
 #
 #  Start of project              : 2011-08-31 by Clemens Barth
 #  First publication in Blender  : 2011-11-11
-#  Last modified                 : 2012-03-23
+#  Last modified                 : 2012-04-18
 #
 #  Acknowledgements: Thanks to ideasman, meta_androcto, truman, kilon,
 #  dairin0d, PKHG, Valter, etc

io_mesh_pdb/import_pdb.py

@@ -25,7 +25,7 @@
 #
 #  Start of project              : 2011-08-31 by Clemens Barth
 #  First publication in Blender  : 2011-11-11
-#  Last modified                 : 2012-03-23
+#  Last modified                 : 2012-04-18
 #
 #  Acknowledgements: Thanks to ideasman, meta_androcto, truman, kilon,
 #  dairin0d, PKHG, Valter, etc