Sorry, but Oxfam contacted us again that the problem still persists. 

The last occurrence of this problem we have seen was  at 11:59:01 BST:

AttributeError: 'PageTemplateFile' object has no attribute 'navigation'

 - Expression: "old_layout.navigation"
 - Filename:   /srv/multikarl/production/11/eggs/karl-3.98-py2.6.egg/karl/content/views/templates/intranet_layout.pt
 - Location:   (40:39)

 - Source:     ... tal:content="structure old_layout.navigation"/>
                                          ^^^^^^^^^^^^^^^^^^^^^
 - Arguments:  user_can_edit: True
               repeat: {...} (0)
               renderer_name: templates/show_referencemanual.pt
               next_entry: <NoneType - at 0xb7779340L>
               head_data: <script type="text/javascript">\nwindow._karl_clien...
               actions: <list - at 0x137050ac>
               context_tools: <list - at 0xd24bb8c>
               renderer_info: <RendererHelper - at 0xd24bc0c>
               api: <TemplateAPI - at 0xcc6a54c>
               backto: {...} (2)
               panel: <instancemethod render_panel at 0xc5445cc>
               layout: <Layout - at 0xd8972ac>
               request: <Request - at 0x10b23f4c>
               tree: <list - at 0x13705d2c>
               old_layout: <PageTemplateFile - at 0xf216d6c>
               main_template: <PageTemplateFile - at 0xba9e74c>
               context: <ReferenceManual human-resources-pay at 0xdf70c2c>
               previous_entry: <NoneType - at 0xb7779340L>
               view: <NoneType - at 0xb7779340L>
Exception when processing https://karl.oxfam.org.uk/intranets/files/essential-resources/support-and-resources/human-resources/human-resources-pay/
Referer: https://karl.oxfam.org.uk/intranets/oxfamgb/

Traceback (most recent call last):
  File "/srv/multikarl/production/11/eggs/pyramid-1.2.1-py2.6.egg/pyramid/tweens.py", line 17, in excview_tween
    response = handler(request)
  File "/srv/multikarl/production/11/eggs/pyramid_tm-0.5-py2.6.egg/pyramid_tm/__init__.py", line 107, in tm_tween
    return response
  File "/srv/multikarl/production/11/eggs/pyramid_tm-0.5-py2.6.egg/pyramid_tm/__init__.py", line 75, in __exit__
    return self._retry_or_raise(t, v, tb)
  File "/srv/multikarl/production/11/eggs/pyramid_tm-0.5-py2.6.egg/pyramid_tm/__init__.py", line 60, in _retry_or_raise
    reraise(t, v, tb) # otherwise reraise the exception
  File "/srv/multikarl/production/11/eggs/pyramid_tm-0.5-py2.6.egg/pyramid_tm/__init__.py", line 100, in tm_tween
    response = handler(request)
  File "/srv/multikarl/production/11/eggs/pyramid-1.2.1-py2.6.egg/pyramid/router.py", line 153, in handle_request
    response = view_callable(context, request)
  File "/srv/multikarl/production/11/eggs/pyramid-1.2.1-py2.6.egg/pyramid/config/views.py", line 186, in _secured_view
    return view(context, request)
  File "/srv/multikarl/production/11/eggs/pyramid-1.2.1-py2.6.egg/pyramid/config/views.py", line 319, in viewresult_to_response
    result = view(context, request)
  File "/srv/multikarl/production/11/eggs/karl-3.98-py2.6.egg/karl/content/views/references.py", line 222, in reference_outline_view
    request=request,
  File "/srv/multikarl/production/11/eggs/pyramid-1.2.1-py2.6.egg/pyramid/renderers.py", line 114, in render_to_response
    return helper.render_to_response(value, None, request=request)
  File "/srv/multikarl/production/11/eggs/pyramid-1.2.1-py2.6.egg/pyramid/renderers.py", line 422, in render_to_response
    result = self.render(value, system_values, request=request)
  File "/srv/multikarl/production/11/eggs/pyramid-1.2.1-py2.6.egg/pyramid/renderers.py", line 418, in render
    result = renderer(value, system_values)
  File "/srv/multikarl/production/11/eggs/karl-3.98-py2.6.egg/karl/application.py", line 224, in metarenderer
    return classic_renderer(value, system)
  File "/srv/multikarl/production/11/eggs/pyramid-1.2.1-py2.6.egg/pyramid/chameleon_zpt.py", line 49, in __call__
    result = self.template(**system)
  File "/srv/multikarl/production/11/eggs/Chameleon-2.8.2-py2.6.egg/chameleon/template.py", line 125, in __call__
    return self.render(**kwargs)
  File "/srv/multikarl/production/11/eggs/Chameleon-2.8.2-py2.6.egg/chameleon/zpt/template.py", line 258, in render
    return super(PageTemplate, self).render(**vars)
  File "/srv/multikarl/production/11/eggs/Chameleon-2.8.2-py2.6.egg/chameleon/template.py", line 191, in render
    raise_with_traceback(exc, tb)
  File "/srv/multikarl/production/11/eggs/Chameleon-2.8.2-py2.6.egg/chameleon/template.py", line 172, in render
    self._render(stream, econtext, rcontext)
  File "show_referencemanual_92190d1208a71b351d275cda320ae8a47b425758.py", line 330, in render
  File "/srv/multikarl/production/11/eggs/Chameleon-2.8.2-py2.6.egg/chameleon/zpt/template.py", line 262, in include
    self._render(*args, **kwargs)
  File "intranet_layout_e41bd21825d60c4e6a156605f9520ac088e10349.py", line 525, in render
  File "/srv/multikarl/production/11/eggs/Chameleon-2.8.2-py2.6.egg/chameleon/py26.py", line 12, in lookup_attr
    raise exc
AttributeError: 'PageTemplateFile' object has no attribute 'navigation'

 - Expression: "old_layout.navigation"
 - Filename:   /srv/multikarl/production/11/eggs/karl-3.98-py2.6.egg/karl/content/views/templates/intranet_layout.pt
 - Location:   (40:39)

 - Source:     ... tal:content="structure old_layout.navigation"/>
                                          ^^^^^^^^^^^^^^^^^^^^^
 - Arguments:  user_can_edit: True
               repeat: {...} (0)
               renderer_name: templates/show_referencemanual.pt
               next_entry: <NoneType - at 0xb7779340L>
               head_data: <script type="text/javascript">\nwindow._karl_clien...
               actions: <list - at 0x137050ac>
               context_tools: <list - at 0xd24bb8c>
               renderer_info: <RendererHelper - at 0xd24bc0c>
               api: <TemplateAPI - at 0xcc6a54c>
               backto: {...} (2)
               panel: <instancemethod render_panel at 0xc5445cc>
               layout: <Layout - at 0xd8972ac>
               request: <Request - at 0x10b23f4c>
               tree: <list - at 0x13705d2c>
               old_layout: <PageTemplateFile - at 0xf216d6c>
               main_template: <PageTemplateFile - at 0xba9e74c>
               context: <ReferenceManual human-resources-pay at 0xdf70c2c>
               previous_entry: <NoneType - at 0xb7779340L>
               view: <NoneType - at 0xb7779340L>