Still having error in "The URI you submitted has disallowed characters." in CodeIgniter Login with Facebook

Here's what I have for my facebook enabled app

$config['permitted_uri_chars'] = '+=a-z 0-9?~%.,:_\-';

I've seen people who've had success also enabling the below, but mine is still set to FALSE

$config['enable_query_strings'] = TRUE;

facebook codeigniter uri

I had a similar issue today when we upgraded to PHP 5.3, it turns out the solution was to update this line from _filter_uri() in URI.php

if ( ! preg_match("|^[".preg_quote($this->config->item('permitted_uri_chars'))."]+$|i", $str))

if ( ! preg_match('|^['.str_replace(array('\\-', '\-'), '-', preg_quote($this->config->item('permitted_uri_chars'), '-')).']+$|i', $str))

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