[wp-hackers] Rename wp-admin problems

[WP Customizer]

So I decided I want to rename core files and folders to remove the wp-.  I
wrote a simple little program using vb .net that will recursivly edit every
file in a given directory and do a find a replace operation to change name
refrences.  For example it finds refrences to wp-login.php and changes it to
login.php.

It works, for the most part.  One issue it causes in when you rename
wp-admin.  When you access the admin if it was renamed it is visually
broken, see
http://i770.photobucket.com/albums/xx350/wpcustomizer/wp-admin.jpg. Any
ideas on what may cause this?