Image manipulation woes, currently producing blank images

Code:
function upload(){



            $newFileName = $this->input->post("newFileName");



            $fileArray     = explode('&', $newFileName);



            $badelete     = array_pop($fileArray);



            $result      = '';



            foreach($fileArray as $file){



                $aFile = explode('=', $file);



                $aFile = $aFile[1];



                



                $this->image_lib->clear();



                $sourceimage = $_SERVER['DOCUMENT_ROOT'].'/gallery/'.$aFile;







                $minusExtension = explode('.', $aFile, 2);



                $filename  = $minusExtension[0];



                $extension = $minusExtension[1];



                $thumbnail = $filename.'_thumb.'.$extension;



                $newimage = $_SERVER['DOCUMENT_ROOT'].'/gallery/'.$thumbnail;



                



                // Make squarethumb



                $config['image_library'] = 'GD2';



                $config['source_image'] = $sourceimage;



                $config['new_image']    = $newimage;



                $config['maintain_ratio'] = TRUE;



                $config['width'] = '200px';



                $config['height'] = '200px';



                $this->image_lib->initialize($config); 



                if (!$this->image_lib->resize()){



                    echo "<br />Fullsize<br />";



                    echo $this->image_lib->display_errors();



                }



                else {



                    $this->image_lib->clear();



                    



                    if(!is_file($newimage)){



                        echo "Thumbnail file not found";



                    }



                    else {



                        $config2['image_library'] = 'GD2';



                        $config2['x_axis'] = 200;



                        $config2['y_axis'] = 200;



                        $config2['create_thumb'] = FALSE;



                        $config2['maintain_ratio'] = FALSE;



                        $config2['source_image'] = $newimage;



                        $this->image_lib->initialize($config2); 



        



                        if (!$this->image_lib->crop()){



                            echo "<br />Thumbnail<br />";



                            echo $this->image_lib->display_errors();



                        }



                        $this->image_lib->clear();



                    }



                }



                $data = $this->gallery_model->add_image($aFile);

            }



    }