Pattern Unlock not working and impossible to deactivate

Sep 2, 2013
A couple of months ago I activated the screen lock pattern, after a few days I noted that the pattern was in fact not working, any combination unlocked the device (even one simple touch!), so I decided to simply deactivate the darn thing, but I can not even do that, after selecting the option ¨Disable Screen Lock¨ or select ¨More screen locks¨ nothing changes:

Currently I don´t have time to do a complete format + reinstall (plus I waiting for V6 for that :p), so I have to ask you guys if you know a way to disable it.