Listing Image Upload HTTP Error

I am also experiencing an HTTP Error when trying to upload files under 150kb to my listings. I did go to the StackExchange link and verified with my hosting provider the memory limit was set to 64MB+ and the mod_security were set to off. I also added the PHP code below in functions.php to no avail.

add_filter( ‘wp_image_editors’, ‘change_graphic_lib’ );

function change_graphic_lib($array) {
return array( ‘WP_Image_Editor_GD’, ‘WP_Image_Editor_Imagick’ );
}