[eluser]Michael Ekoka[/eluser]
I'm suspecting a problem with discrepancies between the case insensitive way php4 handles function names and the case sensitive hash values. Try renaming the function from cinputCheck to cinput_check and change the validation accordingly:
Code:
$rules['cinput'] = "required|callback_cinput_check";
...
$this->validation->set_message('cinput_check', 'Incorrect Captcha characters.');