Cart Class

[eluser]craig.hoog[/eluser]
[quote author="the_unforgiven" date="1336563664"]

Code:

function update_cart()
{
  $update = array(
          'rowid' => $this->input->post('rowid'),
          'qty'   => $this->input->post('qty')
  );

  $this->cart->update($update);
  $this->session->set_flashdata('message','Your shopping cart has been updated!');
    redirect('home/cart','refresh');
}

[/quote]

Everything looks good at a quick glance.
Can you output the Cart rowid and make sure your input->post('rowid') is correct?