Concrete breaks after I change the config file :(

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I moved my concrete5 website from an old server onto Bluehost. It works here:

http://74.220.219.73/~thrdmsco/3dms/...

but, I would like 3dms.com to point to this location. Through bluehost, I have assigned the domain to this folder on my account, then went into the config/site.php file and made the change from:

define('BASE_URL', 'http://74.220.219.73');
define('DIR_REL', '/~thrdmsco/3dms');


to

define('BASE_URL', 'http://3dms.com');
define('DIR_REL', '');



But then... the website stops working. I receive a concrete page not found error. I have talked with bluehost support and they do not know how to help. Anyone have any ideas? Thanks!