Permission error on notes when creating user

I'm just getting started with OpenERP, so forgive me if I'm missing something obvious.

Some time ago I ran into this bug: https://bugs.launchpad.net/openobject-server/+bug/1021378 concerning access rights issues when creating a user.
After applying the patch, I could still not create a new user. I thought I still had the same issue, but on closer inspection I found that the error now concerned a different object: Notes instead of Users.

So, just as with the other bug, the issue is I can only create new users as the default admin user, not as any other user that has administrative permissions.

At first I got this exception:
2013-03-17 12:52:14,878 5200 ERROR segrey openerp.netsvc: Access Denied
The requested operation cannot be completed due to security restrictions. Please contact your system administrator.

(Document type: Note Stage, Operation: read)
Traceback (most recent call last):
  File "C:\Program Files (x86)\OpenERP 7.0\Server\server\.\openerp\netsvc.py", line 293, in dispatch_rpc
  File "C:\Program Files (x86)\OpenERP 7.0\Server\server\.\openerp\service\web_services.py", line 626, in dispatch
  File "C:\Program Files (x86)\OpenERP 7.0\Server\server\.\openerp\osv\osv.py", line 188, in execute_kw
  File "C:\Program Files (x86)\OpenERP 7.0\Server\server\.\openerp\osv\osv.py", line 144, in wrapper
except_osv: (u'Access Denied', u'The requested operation cannot be completed due to security restrictions. Please contact your system administrator.\n\n(Document type: Note Stage, Operation: read)')

I modified osv.py to not eat-up the exception. Then I got this:
Server Traceback (most recent call last):
  File "C:\Program Files (x86)\OpenERP 7.0\Server\server\openerp\addons\web\session.py", line 90, in send
  File "C:\Program Files (x86)\OpenERP 7.0\Server\server\.\openerp\netsvc.py", line 293, in dispatch_rpc
  File "C:\Program Files (x86)\OpenERP 7.0\Server\server\.\openerp\service\web_services.py", line 626, in dispatch
  File "C:\Program Files (x86)\OpenERP 7.0\Server\server\.\openerp\osv\osv.py", line 189, in execute_kw
  File "C:\Program Files (x86)\OpenERP 7.0\Server\server\.\openerp\osv\osv.py", line 131, in wrapper
  File "C:\Program Files (x86)\OpenERP 7.0\Server\server\.\openerp\osv\osv.py", line 198, in execute
  File "C:\Program Files (x86)\OpenERP 7.0\Server\server\.\openerp\osv\osv.py", line 186, in execute_cr
  File "C:\Program Files (x86)\OpenERP 7.0\Server\server\openerp\addons\crm\crm_meeting.py", line 76, in create
  File "C:\Program Files (x86)\OpenERP 7.0\Server\server\openerp\addons\auth_signup\res_users.py", line 274, in create
  File "C:\Program Files (x86)\OpenERP 7.0\Server\server\openerp\addons\note\note.py", line 194, in create
  File "C:\Program Files (x86)\OpenERP 7.0\Server\server\.\openerp\osv\orm.py", line 5023, in copy
  File "C:\Program Files (x86)\OpenERP 7.0\Server\server\.\openerp\osv\orm.py", line 4914, in copy_data
  File "C:\Program Files (x86)\OpenERP 7.0\Server\server\.\openerp\osv\orm.py", line 3604, in read
  File "C:\Program Files (x86)\OpenERP 7.0\Server\server\.\openerp\osv\orm.py", line 3659, in _read_flat
  File "C:\Program Files (x86)\OpenERP 7.0\Server\server\.\openerp\osv\orm.py", line 3862, in _check_record_rules_result_count
except_orm: (u'Access Denied', u'The requested operation cannot be completed due to security restrictions. Please contact your system administrator.\n\n(Document type: Note Stage, Operation: read)')

So as far as I understand there seems to be an issue copying notes to the new user. But my knowledge does not stretch far enough to interpret this further.