Form validation won't call the callback function

[eluser]xarazar[/eluser]
@Lucas Vasconcelos
Thanks mate. Yes indeed there's some code missing but this is really not the point.
The problem is that my form validation callback doesn't trigger the callback function unless I modify Form_validation with the code I posted above.
I built around a dozen of websites on CI and never had this problem. But for my recent development I downloaded the latest version and shazam! A little surprise.
Never mind. Thanks for replying anyway.