diff --git a/GPy/core/parameterization/array_core.py b/GPy/core/parameterization/array_core.py
index e3a5b137..6920e894 100644
--- a/GPy/core/parameterization/array_core.py
+++ b/GPy/core/parameterization/array_core.py
@@ -1,7 +1,7 @@
 # Copyright (c) 2012, GPy authors (see AUTHORS.txt).
 # Licensed under the BSD 3-clause license (see LICENSE.txt)
 
-__updated__ = '2013-12-16'
+__updated__ = '2014-03-17'
 
 import numpy as np
 from parameter_core import Observable
@@ -18,7 +18,7 @@ class ObservableArray(np.ndarray, Observable):
         if not isinstance(input_array, ObservableArray):
             obj = np.atleast_1d(np.require(input_array, dtype=np.float64, requirements=['W', 'C'])).view(cls)
         else: obj = input_array
-        cls.__name__ = "ObservableArray\n     "
+        cls.__name__ = "ObsAr" # because of fixed printing of `array` in np printing
         super(ObservableArray, obj).__init__(*a, **kw)
         return obj
 
@@ -30,6 +30,14 @@ class ObservableArray(np.ndarray, Observable):
     def __array_wrap__(self, out_arr, context=None):
         return out_arr.view(np.ndarray)
 
+    def __reduce__(self):
+        func, args, state = np.ndarray.__reduce__(self)
+        return func, args, (state, Observable._getstate(self))
+
+    def __setstate__(self, state):
+        np.ndarray.__setstate__(self, state[0])
+        Observable._setstate(self, state[1])
+
     def _s_not_empty(self, s):
         # this checks whether there is something picked by this slice.
         return True
diff --git a/GPy/core/parameterization/param.py b/GPy/core/parameterization/param.py
index 2ede8436..ed394806 100644
--- a/GPy/core/parameterization/param.py
+++ b/GPy/core/parameterization/param.py
@@ -269,6 +269,8 @@ class Param(OptimizationHandlable, ObservableArray):
     @property
     def _ties_str(self):
         return ['']
+    def _ties_for(self, ravi):
+        return [['N/A']]*ravi.size
     def __repr__(self, *args, **kwargs):
         name = "\033[1m{x:s}\033[0;0m:\n".format(
                             x=self.hierarchy_name())
@@ -312,7 +314,7 @@ class Param(OptimizationHandlable, ObservableArray):
         ravi = self._raveled_index(filter_)
         if constr_matrix is None: constr_matrix = self.constraints.properties_for(ravi)
         if prirs is None: prirs = self.priors.properties_for(ravi)
-        if ties is None: ties = [['N/A']]*self.size
+        if ties is None: ties = self._ties_for(ravi)
         ties = [' '.join(map(lambda x: x, t)) for t in ties]
         if lc is None: lc = self._max_len_names(constr_matrix, __constraints_name__)
         if lx is None: lx = self._max_len_values()
diff --git a/GPy/core/parameterization/parameter_core.py b/GPy/core/parameterization/parameter_core.py
index f58143bd..0aab890c 100644
--- a/GPy/core/parameterization/parameter_core.py
+++ b/GPy/core/parameterization/parameter_core.py
@@ -16,7 +16,7 @@ Observable Pattern for patameterization
 from transformations import Transformation, Logexp, NegativeLogexp, Logistic, __fixed__, FIXED, UNFIXED
 import numpy as np
 
-__updated__ = '2014-03-14'
+__updated__ = '2014-03-17'
 
 class HierarchyError(Exception):
     """
@@ -56,7 +56,7 @@ class InterfacePickleFunctions(object):
         """
         raise NotImplementedError, "To be able to use pickling you need to implement this method"
 
-class Pickleable(object):
+class Pickleable(InterfacePickleFunctions):
     """
     Make an object pickleable (See python doc 'pickling').
 
@@ -95,7 +95,7 @@ class Pickleable(object):
     def _has_get_set_state(self):
         return '_getstate' in vars(self.__class__) and '_setstate' in vars(self.__class__)
 
-class Observable(InterfacePickleFunctions):
+class Observable(Pickleable):
     """
     Observable pattern for parameterization.
 
@@ -155,6 +155,7 @@ class Observable(InterfacePickleFunctions):
 
     def _getstate(self):
         return [self._observer_callables_]
+
     def _setstate(self, state):
         self._observer_callables_ = state.pop()
 
diff --git a/GPy/testing/observable_tests.py b/GPy/testing/observable_tests.py
index ebda1630..f8be4a48 100644
--- a/GPy/testing/observable_tests.py
+++ b/GPy/testing/observable_tests.py
@@ -8,7 +8,7 @@ from GPy.core.parameterization.parameterized import Parameterized
 from GPy.core.parameterization.param import Param
 import numpy
 
-# One trigger in init 
+# One trigger in init
 _trigger_start = -1
 
 class ParamTestParent(Parameterized):
@@ -21,11 +21,9 @@ class ParameterizedTest(Parameterized):
     params_changed_count = _trigger_start
     def parameters_changed(self):
         self.params_changed_count += 1
-    def _set_params(self, params, trigger_parent=True):
-        Parameterized._set_params(self, params, trigger_parent=trigger_parent)
 
 class Test(unittest.TestCase):
-    
+
     def setUp(self):
         self.parent = ParamTestParent('test parent')
         self.par = ParameterizedTest('test model')
@@ -41,12 +39,12 @@ class Test(unittest.TestCase):
 
         self.parent.add_parameter(self.par)
         self.parent.add_parameter(self.par2)
-        
+
         self._observer_triggered = None
         self._trigger_count = 0
         self._first = None
         self._second = None
-        
+
     def _trigger(self, which):
         self._observer_triggered = float(which)
         self._trigger_count += 1
@@ -54,18 +52,18 @@ class Test(unittest.TestCase):
             self._second = self._trigger
         else:
             self._first = self._trigger
-    
+
     def _trigger_priority(self, which):
         if self._first is not None:
             self._second = self._trigger_priority
         else:
             self._first = self._trigger_priority
-            
+
     def test_observable(self):
         self.par.add_observer(self, self._trigger, -1)
         self.assertEqual(self.par.params_changed_count, 0, 'no params changed yet')
         self.assertEqual(self.par.params_changed_count, self.parent.parent_changed_count, 'parent should be triggered as often as param')
-        
+
         self.p[0,1] = 3 # trigger observers
         self.assertEqual(self._observer_triggered, 3, 'observer should have triggered')
         self.assertEqual(self._trigger_count, 1, 'observer should have triggered once')
@@ -78,14 +76,14 @@ class Test(unittest.TestCase):
         self.assertEqual(self._trigger_count, 1, 'observer should have triggered once')
         self.assertEqual(self.par.params_changed_count, 2, 'params changed second')
         self.assertEqual(self.par.params_changed_count, self.parent.parent_changed_count, 'parent should be triggered as often as param')
-        
+
         self.par.add_observer(self, self._trigger, -1)
         self.p[2,1] = 4
         self.assertEqual(self._observer_triggered, 4, 'observer should have triggered')
         self.assertEqual(self._trigger_count, 2, 'observer should have triggered once')
         self.assertEqual(self.par.params_changed_count, 3, 'params changed second')
         self.assertEqual(self.par.params_changed_count, self.parent.parent_changed_count, 'parent should be triggered as often as param')
-        
+
         self.par.remove_observer(self, self._trigger)
         self.p[0,1] = 3
         self.assertEqual(self._observer_triggered, 4, 'observer should not have triggered')
@@ -99,7 +97,7 @@ class Test(unittest.TestCase):
         self.par._trigger_params_changed()
         self.assertEqual(self.par.params_changed_count, 1, 'now params changed')
         self.assertEqual(self.parent.parent_changed_count, self.par.params_changed_count)
-        
+
         self.par._param_array_[:] = 2
         self.par._trigger_params_changed()
         self.assertEqual(self.par.params_changed_count, 2, 'now params changed')
@@ -125,13 +123,13 @@ class Test(unittest.TestCase):
 
         self.par.remove_observer(self)
         self._first = self._second = None
-        
+
         self.par.add_observer(self, self._trigger, 1)
         self.par.add_observer(self, self._trigger_priority, 0)
         self.par.notify_observers(0)
         self.assertEqual(self._first, self._trigger, 'priority should be second')
         self.assertEqual(self._second, self._trigger_priority, 'priority should be second')
-        
+
 
 if __name__ == "__main__":
     #import sys;sys.argv = ['', 'Test.testName']
diff --git a/GPy/testing/parameterized_tests.py b/GPy/testing/parameterized_tests.py
index 5b718cbd..754e95db 100644
--- a/GPy/testing/parameterized_tests.py
+++ b/GPy/testing/parameterized_tests.py
@@ -108,7 +108,7 @@ class ParameterizedTest(unittest.TestCase):
         self.assertEqual(self.param.constraints._offset, 3)
 
     def test_fixing_randomize(self):
-        self.white.fix(warning=False)
+        self.white.fix(warning=True)
         val = float(self.test1.white.variance)
         self.test1.randomize()
         self.assertEqual(val, self.white.variance)
@@ -119,6 +119,11 @@ class ParameterizedTest(unittest.TestCase):
         self.testmodel.randomize()
         self.assertEqual(val, self.testmodel.kern.lengthscale)
 
+    def test_printing(self):
+        print self.test1
+        print self.param
+        print self.test1['']
+
 if __name__ == "__main__":
     #import sys;sys.argv = ['', 'Test.test_add_parameter']
     unittest.main()
\ No newline at end of file