diff --git a/overviewer_core/settingsValidators.py b/overviewer_core/settingsValidators.py
index 2cbeaaf..95a958d 100644
--- a/overviewer_core/settingsValidators.py
+++ b/overviewer_core/settingsValidators.py
@@ -45,7 +45,7 @@ def checkBadEscape(s):
 
 def validateWorldPath(worldpath):
     _, worldpath = checkBadEscape(worldpath)
-    abs_path = os.path.abspath(worldpath)
+    abs_path = os.path.abspath(os.path.expanduser(worldpath))
     if not os.path.exists(os.path.join(abs_path, "level.dat")):
         raise ValidationException("No level.dat file in '%s'. Are you sure you have the right path?" % (abs_path,))
     return abs_path
diff --git a/overviewer_core/world.py b/overviewer_core/world.py
index dd67180..33456d8 100644
--- a/overviewer_core/world.py
+++ b/overviewer_core/world.py
@@ -465,10 +465,16 @@ class RotatedRegionSet(RegionSet):
     def get_chunk(self, x, z):
         x,z = self.unrotate(x,z)
         chunk_data = super(RotatedRegionSet, self).get_chunk(x,z)
-        chunk_data['Blocks'] = numpy.rot90(chunk_data['Blocks'], self.north_dir)
-        chunk_data['Data'] = numpy.rot90(chunk_data['Data'], self.north_dir)
-        chunk_data['SkyLight'] = numpy.rot90(chunk_data['SkyLight'], self.north_dir)
-        chunk_data['BlockLight'] = numpy.rot90(chunk_data['BlockLight'], self.north_dir)
+        for section in chunk_data['Sections']:
+            for arrayname in ['Blocks', 'Data', 'SkyLight', 'BlockLight']:
+                array = section[arrayname]
+                # New arrays are arranged with axes Y,Z,X
+                # numpy.rot90 always rotates the first two axes, so for it to
+                # work, we need to temporarily more the X axis to the 0th axis.
+                array = numpy.swapaxes(array, 0,2)
+                array = numpy.rot90(array, self.north_dir)
+                array = numpy.swapaxes(array, 0,2)
+                section[arrayname] = array
         return chunk_data
 
     def get_chunk_mtime(self, x, z):