diff --git a/openerp/modules/module.py b/openerp/modules/module.py
index 98955aff492..ec1c6a1708b 100644
--- a/openerp/modules/module.py
+++ b/openerp/modules/module.py
@@ -400,7 +400,7 @@ def load_openerp_module(module_name):
     initialize_sys_path()
     try:
         mod_path = get_module_path(module_name)
-        zip_mod_path = mod_path + '.zip'
+        zip_mod_path = '' if not mod_path else mod_path + '.zip'
         if not os.path.isfile(zip_mod_path):
             __import__('openerp.addons.' + module_name)
         else:
diff --git a/openerp/modules/registry.py b/openerp/modules/registry.py
index 4aa20f3349d..b06c500a24c 100644
--- a/openerp/modules/registry.py
+++ b/openerp/modules/registry.py
@@ -216,6 +216,11 @@ class RegistryManager(object):
                 del cls.registries[db_name]
                 raise
 
+            # load_modules() above can replace the registry by calling
+            # indirectly new() again (when modules have to be uninstalled).
+            # Yeah, crazy.
+            registry = cls.registries[db_name]
+
             cr = registry.db.cursor()
             try:
                 Registry.setup_multi_process_signaling(cr)
diff --git a/openerp/osv/orm.py b/openerp/osv/orm.py
index 67d365ecf6f..8a432240567 100644
--- a/openerp/osv/orm.py
+++ b/openerp/osv/orm.py
@@ -1077,7 +1077,7 @@ class BaseModel(object):
 
         # Validate rec_name
         if self._rec_name is not None:
-            assert self._rec_name in self._columns.keys() + ['id'], "Invalid rec_name %s for model %s" % (self._rec_name, self._name)
+            assert self._rec_name in self._all_columns.keys() + ['id'], "Invalid rec_name %s for model %s" % (self._rec_name, self._name)
         else:
             self._rec_name = 'name'
 
@@ -1362,11 +1362,9 @@ class BaseModel(object):
                      noupdate=noupdate, res_id=id, context=context))
                 cr.execute('RELEASE SAVEPOINT model_load_save')
             except psycopg2.Warning, e:
-                _logger.exception('Failed to import record %s', record)
                 messages.append(dict(info, type='warning', message=str(e)))
                 cr.execute('ROLLBACK TO SAVEPOINT model_load_save')
             except psycopg2.Error, e:
-                _logger.exception('Failed to import record %s', record)
                 messages.append(dict(
                     info, type='error',
                     **PGERROR_TO_OE[e.pgcode](self, fg, info, e)))
@@ -5327,11 +5325,28 @@ def convert_pgerror_23502(model, fields, info, e):
         'message': message,
         'field': field_name,
     }
+def convert_pgerror_23505(model, fields, info, e):
+    m = re.match(r'^duplicate key (?P<field>\w+) violates unique constraint',
+                 str(e))
+    field_name = m.group('field')
+    if not m or field_name not in fields:
+        return {'message': unicode(e)}
+    message = _(u"The value for the field '%s' already exists.") % field_name
+    field = fields.get(field_name)
+    if field:
+        message = _(u"%s This might be '%s' in the current model, or a field "
+                    u"of the same name in an o2m.") % (message, field['string'])
+    return {
+        'message': message,
+        'field': field_name,
+    }
 
 PGERROR_TO_OE = collections.defaultdict(
     # shape of mapped converters
     lambda: (lambda model, fvg, info, pgerror: {'message': unicode(pgerror)}), {
     # not_null_violation
     '23502': convert_pgerror_23502,
+    # unique constraint error
+    '23505': convert_pgerror_23505,
 })
 # vim:expandtab:smartindent:tabstop=4:softtabstop=4:shiftwidth=4:
diff --git a/openerp/report/report_sxw.py b/openerp/report/report_sxw.py
index b1f1e3d5891..325690205ef 100644
--- a/openerp/report/report_sxw.py
+++ b/openerp/report/report_sxw.py
@@ -189,6 +189,8 @@ class rml_parse(object):
         return newtag, attrs
 
     def _ellipsis(self, char, size=100, truncation_str='...'):
+        if not char:
+            return ''
         if len(char) <= size:
             return char
         return char[:size-len(truncation_str)] + truncation_str
diff --git a/openerp/service/workers.py b/openerp/service/workers.py
index ed77b28cf1b..6d2da2d927b 100644
--- a/openerp/service/workers.py
+++ b/openerp/service/workers.py
@@ -319,7 +319,13 @@ class WorkerHTTP(Worker):
         fcntl.fcntl(client, fcntl.F_SETFD, flags)
         # do request using WorkerBaseWSGIServer monkey patched with socket
         self.server.socket = client
-        self.server.process_request(client,addr)
+        # tolerate broken pipe when the http client closes the socket before
+        # receiving the full reply
+        try:
+            self.server.process_request(client,addr)
+        except IOError, e:
+            if e.errno != errno.EPIPE:
+                raise
         self.request_count += 1
 
     def process_work(self):
diff --git a/openerp/tests/addons/test_impex/ir.model.access.csv b/openerp/tests/addons/test_impex/ir.model.access.csv
index 9a674d9ee1f..fd0f7370c67 100644
--- a/openerp/tests/addons/test_impex/ir.model.access.csv
+++ b/openerp/tests/addons/test_impex/ir.model.access.csv
@@ -23,3 +23,4 @@ access_export_one2many_child_2,access_export_one2many_child_2,model_export_one2m
 access_export_many2many_other,access_export_many2many_other,model_export_many2many_other,,1,1,1,1
 access_export_selection_withdefault,access_export_selection_withdefault,model_export_selection_withdefault,,1,1,1,1
 access_export_one2many_recursive,access_export_one2many_recursive,model_export_one2many_recursive,,1,1,1,1
+access_export_unique,access_export_unique,model_export_unique,,1,1,1,1
diff --git a/openerp/tests/addons/test_impex/models.py b/openerp/tests/addons/test_impex/models.py
index 95a7f90bda8..8c76850d628 100644
--- a/openerp/tests/addons/test_impex/models.py
+++ b/openerp/tests/addons/test_impex/models.py
@@ -144,3 +144,13 @@ class RecO2M(orm.Model):
         'value': fields.integer(),
         'child': fields.one2many('export.one2many.multiple', 'parent_id')
     }
+
+class OnlyOne(orm.Model):
+    _name = 'export.unique'
+
+    _columns = {
+        'value': fields.integer(),
+    }
+    _sql_constraints = [
+        ('value_unique', 'unique (value)', "The value must be unique"),
+    ]
diff --git a/openerp/tests/addons/test_impex/tests/test_load.py b/openerp/tests/addons/test_impex/tests/test_load.py
index fe01a267d58..0afbf6f49c3 100644
--- a/openerp/tests/addons/test_impex/tests/test_load.py
+++ b/openerp/tests/addons/test_impex/tests/test_load.py
@@ -1149,3 +1149,29 @@ class test_datetime(ImporterCase):
         self.assertEqual(
             values(self.read(domain=[('id', 'in', result['ids'])])),
             ['2012-02-03 11:11:11'])
+
+class test_unique(ImporterCase):
+    model_name = 'export.unique'
+
+    @mute_logger('openerp.sql_db')
+    def test_unique(self):
+        result = self.import_(['value'], [
+            ['1'],
+            ['1'],
+            ['2'],
+            ['3'],
+            ['3'],
+        ])
+        self.assertFalse(result['ids'])
+        self.assertEqual(result['messages'], [
+            dict(message=u"The value for the field 'value' already exists. "
+                         u"This might be 'unknown' in the current model, "
+                         u"or a field of the same name in an o2m.",
+                 type='error', rows={'from': 1, 'to': 1},
+                 record=1, field='value'),
+            dict(message=u"The value for the field 'value' already exists. "
+                         u"This might be 'unknown' in the current model, "
+                         u"or a field of the same name in an o2m.",
+                 type='error', rows={'from': 4, 'to': 4},
+                 record=4, field='value'),
+        ])