stupid input problem

[eluser]soupdragon[/eluser]
Ok I'm sure i am doing something wrong but i can't work out what !

In my controller i am not initializing the input class
cos ...This class is initialized automatically by the system so there is no need to do it manually.

but
print_R($_POST);
herewith i have data


whereas this is empty ?
print_R($this->input->post());

so what have i missed ??