When I enable in config.php define(‘DEVELOPMENT’, true); I received a blank page on front store with an error:
[color=#000000][font=Times][size=1]Uncaught TypeError: Cannot read property ‘replace’ of null[/size][/font][/color]
[attachment=9731:Screen Shot 2015-06-21 at 18.20.59.png]
Shouldn't be done in config.php but instead in config.local.php.
But either way, that is an odd error. I don't think they are related. A define has no 'type' other than const.
What does your php error_log file say?