diff --git a/camb/baseconfig.py b/camb/baseconfig.py
index ba2974a6..27aa6e43 100644
--- a/camb/baseconfig.py
+++ b/camb/baseconfig.py
@@ -307,7 +307,7 @@ def AllocatableObjectArray(cls=None):
 
 
 class AllocatableArrayInt(_AllocatableArray):
-    _dtype = int
+    _dtype = np.int32
     _ctype = c_int
 
 
@@ -646,7 +646,7 @@ def __getstate__(self) -> dict:
         state = {}
         for field_name, field_type in self.get_all_fields():
             obj = getattr(self, field_name)
-            if isinstance(obj, (ctypes.Array, np.ndarray)):
+            if isinstance(obj, (ctypes.Array, np.ndarray, FortranAllocatable)):
                 state[field_name] = list(obj[:len(obj)])
             elif isinstance(obj, ctypes.c_void_p):
                 if obj.value is not None:
diff --git a/camb/tests/camb_test.py b/camb/tests/camb_test.py
index eb425214..cfc6b41e 100644
--- a/camb/tests/camb_test.py
+++ b/camb/tests/camb_test.py
@@ -451,6 +451,8 @@ def testSave(self):
         pars = camb.set_params(H0=67.5, ombh2=0.022, omch2=0.122, As=2e-9, ns=0.95,
                                redshifts=[0.4, 31.5], kmax=0.1)
         pars.set_dark_energy(w=-0.7, wa=0.2, dark_energy_model='ppf')
+        from camb.sources import GaussianSourceWindow
+        pars.SourceWindows = [GaussianSourceWindow(), GaussianSourceWindow(redshift=1)]
         s = repr(pars)
         pars2 = eval(s)
         assert (repr(pars2) == s)
@@ -458,6 +460,9 @@ def testSave(self):
         b = pickle.dumps(pars)
         pars2 = pickle.loads(b)
         assert (repr(pars2) == s)
+        pars2.InitPower = initialpower.SplinedInitialPower()
+        with self.assertRaises(TypeError):
+            repr(pars2)
 
     def testSigmaR(self):
         pars = camb.CAMBparams()
diff --git a/docs/CAMBdemo.html b/docs/CAMBdemo.html
index 59b59af1..bfa7d5af 100644
--- a/docs/CAMBdemo.html
+++ b/docs/CAMBdemo.html
@@ -14640,7 +14640,7 @@
 
 
 <div class="jp-RenderedText jp-OutputArea-output" data-mime-type="text/plain">
-<pre>Using CAMB 1.5.1 installed at c:\work\dist\git\camb\camb
+<pre>Using CAMB 1.5.3 installed at c:\work\dist\git\camb\camb
 </pre>
 </div>
 </div>
@@ -15193,6 +15193,7 @@
 <span class="n">pars</span> <span class="o">=</span> <span class="n">camb</span><span class="o">.</span><span class="n">read_ini</span><span class="p">(</span><span class="s1">&#39;https://raw.githubusercontent.com/cmbant/CAMB/master/inifiles/planck_2018.ini&#39;</span><span class="p">)</span>
 <span class="c1"># for a local github installation you can just do </span>
 <span class="c1"># pars=camb.read_ini(os.path.join(camb_path,&#39;inifiles&#39;,&#39;planck_2018.ini&#39;))</span>
+<span class="c1"># view parameter objects using print(), or use pickle or repr to save and restore</span>
 <span class="nb">print</span><span class="p">(</span><span class="n">pars</span><span class="p">)</span>
 </pre></div>
 
@@ -16498,7 +16499,7 @@
 <span class="k">for</span> <span class="n">z</span> <span class="ow">in</span> <span class="n">zplot</span><span class="p">:</span>
     <span class="n">plt</span><span class="o">.</span><span class="n">loglog</span><span class="p">(</span><span class="n">k</span><span class="p">,</span> <span class="n">PK</span><span class="o">.</span><span class="n">P</span><span class="p">(</span><span class="n">z</span><span class="p">,</span><span class="n">k</span><span class="p">))</span>
 <span class="n">plt</span><span class="o">.</span><span class="n">xlim</span><span class="p">([</span><span class="mf">1e-4</span><span class="p">,</span><span class="n">kmax</span><span class="p">])</span>
-<span class="n">plt</span><span class="o">.</span><span class="n">xlabel</span><span class="p">(</span><span class="s1">&#39;k Mpc&#39;</span><span class="p">)</span>
+<span class="n">plt</span><span class="o">.</span><span class="n">xlabel</span><span class="p">(</span><span class="sa">r</span><span class="s1">&#39;k Mpc&#39;</span><span class="p">)</span>
 <span class="n">plt</span><span class="o">.</span><span class="n">ylabel</span><span class="p">(</span><span class="s1">&#39;$P_\Psi\, Mpc^{-3}$&#39;</span><span class="p">)</span>
 <span class="n">plt</span><span class="o">.</span><span class="n">legend</span><span class="p">([</span><span class="s1">&#39;z=</span><span class="si">%s</span><span class="s1">&#39;</span><span class="o">%</span><span class="k">z</span> for z in zplot]);
 </pre></div>
@@ -18763,7 +18764,7 @@ <h3 id="Animations">Animations<a class="anchor-link" href="#Animations">&#182;</
 
 
 <div class="jp-RenderedText jp-OutputArea-output" data-mime-type="application/vnd.jupyter.stderr">
-<pre>C:\Users\Antony\AppData\Local\Temp\ipykernel_29556\455262666.py:12: UserWarning: Data has no positive values, and therefore cannot be log-scaled.
+<pre>C:\Users\Antony\AppData\Local\Temp\ipykernel_43884\455262666.py:12: UserWarning: Data has no positive values, and therefore cannot be log-scaled.
   ax.set_xlim(k[0], k[-1])
 </pre>
 </div>