System notes: (Odoo version 8.0-9b67a48, Ubuntu Server 14.04, x64)

When clicking Preferences from the dropdown menu in the upper right corner, and/or clicking Users in the Settings-->Users-->Users  menu, I only get a long trace telling me that there is an handle exeception, trace output:

Traceback (most recent call last): File "/usr/lib/python2.7/dist-packages/openerp/http.py", line 500, in _handle_exception return super(JsonRequest, self)._handle_exception(exception) File "/usr/lib/python2.7/dist-packages/openerp/http.py", line 517, in dispatch result = self._call_function(**self.params) File "/usr/lib/python2.7/dist-packages/openerp/http.py", line 283, in _call_function return checked_call(self.db, *args, **kwargs) File "/usr/lib/python2.7/dist-packages/openerp/service/model.py", line 113, in wrapper return f(dbname, *args, **kwargs) File "/usr/lib/python2.7/dist-packages/openerp/http.py", line 280, in checked_call return self.endpoint(*a, **kw) File "/usr/lib/python2.7/dist-packages/openerp/http.py", line 733, in __call__ return self.method(*args, **kw) File "/usr/lib/python2.7/dist-packages/openerp/http.py", line 376, in response_wrap response = f(*args, **kw) File "/usr/lib/python2.7/dist-packages/openerp/addons/web/controllers/main.py", line 1244, in load action = request.session.model(action_type).read([action_id], False, ctx) File "/usr/lib/python2.7/dist-packages/openerp/http.py", line 835, in proxy result = meth(cr, request.uid, *args, **kw) File "/usr/lib/python2.7/dist-packages/openerp/api.py", line 237, in wrapper return old_api(self, *args, **kwargs) File "/usr/lib/python2.7/dist-packages/openerp/addons/base/ir/ir_actions.py", line 326, in read results = super(ir_actions_act_window, self).read(cr, uid, ids, fields=fields, context=context, load=load) File "/usr/lib/python2.7/dist-packages/openerp/api.py", line 237, in wrapper return old_api(self, *args, **kwargs) File "/usr/lib/python2.7/dist-packages/openerp/models.py", line 3069, in read result = BaseModel.read(records, fields, load=load) File "/usr/lib/python2.7/dist-packages/openerp/api.py", line 235, in wrapper return new_api(self, *args, **kwargs) File "/usr/lib/python2.7/dist-packages/openerp/models.py", line 3101, in read self._read_from_database(stored) File "/usr/lib/python2.7/dist-packages/openerp/api.py", line 235, in wrapper return new_api(self, *args, **kwargs) File "/usr/lib/python2.7/dist-packages/openerp/models.py", line 3263, in _read_from_database res2 = self._columns[f].get(cr, self._model, ids, f, user, context=context, values=result) File "/usr/lib/python2.7/dist-packages/openerp/osv/fields.py", line 1312, in get result = self._fnct(obj, cr, uid, ids, name, self._arg, context) File "/usr/lib/python2.7/dist-packages/openerp/addons/base/ir/ir_actions.py", line 267, in _search_view 'search', context=context) File "/usr/lib/python2.7/dist-packages/openerp/api.py", line 237, in wrapper return old_api(self, *args, **kwargs) File "/usr/lib/python2.7/dist-packages/openerp/models.py", line 1573, in fields_view_get xarch, xfields = View.postprocess_and_fields(cr, uid, self._name, etree.fromstring(result['arch']), view_id, context=ctx) File "/usr/lib/python2.7/dist-packages/openerp/api.py", line 237, in wrapper return old_api(self, *args, **kwargs) File "/usr/lib/python2.7/dist-packages/openerp/addons/base/ir/ir_ui_view.py", line 804, in postprocess_and_fields fields = Model.fields_get(cr, user, None, context) File "/usr/lib/python2.7/dist-packages/openerp/api.py", line 237, in wrapper return old_api(self, *args, **kwargs) File "/usr/lib/python2.7/dist-packages/openerp/addons/base/res/res_users.py", line 890, in fields_get res = super(users_view, self).fields_get(cr, uid, allfields, context, write_access) File "/usr/lib/python2.7/dist-packages/openerp/api.py", line 237, in wrapper return old_api(self, *args, **kwargs) File "/usr/lib/python2.7/dist-packages/openerp/models.py", line 3014, in fields_get res[fname] = field.get_description(recs.env) File "/usr/lib/python2.7/dist-packages/openerp/fields.py", line 570, in get_description value = value(env) File "/usr/lib/python2.7/dist-packages/openerp/fields.py", line 1259, in _description_selection return selection(env[self.model_name]) File "/usr/lib/python2.7/dist-packages/openerp/fields.py", line 1233, in <lambda> self.selection = lambda model: field._description_selection(model.env) File "/usr/lib/python2.7/dist-packages/openerp/fields.py", line 1266, in _description_selection return [(value, translate(label)) for value, label in selection] TypeError: 'NoneType' object is not iterable

I've tested using a "fresh" installation as well, but the problem remains - anybody have an idea on what might cause this error?