I am not sure why as I haven't done anything, but all the images on my website have stopped displaying. 

I think ir.attachment has stopped working as images are not displayed and new images can not be uploaded.

Everything else in relation to the database seems to be working. Running Version 8.0-20150518 on a debian server.

Here is some log from odoo-server.log

2015-08-18 13:30:37,399 2605 ERROR odoo_bilby_02 openerp.addons.website.controllers.main: Failed to upload image to attachment
Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/openerp/addons/website/controllers/main.py", line 326, in attach
    }, request.context)
  File "/usr/lib/python2.7/dist-packages/openerp/api.py", line 241, in wrapper
    return old_api(self, *args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/openerp/addons/website/models/website.py", line 740, in create
    cr, uid, values, context=context)
  File "/usr/lib/python2.7/dist-packages/openerp/api.py", line 241, in wrapper
    return old_api(self, *args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/openerp/addons/document/document.py", line 135, in create
    return super(document_file, self).create(cr, uid, vals, context)
  File "/usr/lib/python2.7/dist-packages/openerp/api.py", line 241, in wrapper
    return old_api(self, *args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/openerp/addons/base/ir/ir_attachment.py", line 354, in create
    return super(ir_attachment, self).create(cr, uid, values, context)
  File "/usr/lib/python2.7/dist-packages/openerp/api.py", line 241, in wrapper
    return old_api(self, *args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/openerp/api.py", line 336, in old_api
    result = method(recs, *args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/openerp/models.py", line 4074, in create
    record = self.browse(self._create(old_vals))
  File "/usr/lib/python2.7/dist-packages/openerp/api.py", line 239, in wrapper
    return new_api(self, *args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/openerp/api.py", line 462, in new_api
    result = method(self._model, cr, uid, *args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/openerp/models.py", line 4259, in _create
    result += self._columns[field].set(cr, self, id_new, field, vals[field], user, rel_context) or []
  File "/usr/lib/python2.7/dist-packages/openerp/osv/fields.py", line 1477, in set
    self._fnct_inv(obj, cr, user, id, name, value, self._fnct_inv_arg, context)
  File "/usr/lib/python2.7/dist-packages/openerp/addons/base/ir/ir_attachment.py", line 176, in _data_set
    fname_to_delete = attach.store_fname
  File "/usr/lib/python2.7/dist-packages/openerp/fields.py", line 823, in __get__
    return record._cache[self]
  File "/usr/lib/python2.7/dist-packages/openerp/models.py", line 5931, in __getitem__
    return value.get() if isinstance(value, SpecialValue) else value
  File "/usr/lib/python2.7/dist-packages/openerp/fields.py", line 55, in get
    raise self.exception
AccessError: ('AccessError', u'The requested operation cannot be completed due to security restrictions. Please contact your system administrator.\n\n(Document type: ir.attachment, Operation: read)') 

Any ideas on how to restore would be appreciated.

Thanks