I just faced this problem recently, I don't what causes it. But I need help fixing it.
The error are :
http://www.udesign.my/aaf4/wp-admin/admin-ajax.php?action=woocommerce_checkout Failed to load resource: the server responded with a status of 500 (Internal Server Error) http://fonts.googleapis.com/css?family=century+gothic+:300,400 Failed to load resource: the server responded with a status of 400 (Bad Request)
The theme I'm using is ,
Love Fashion - Responsive WordPress Theme
I've tried accessing my FTP, checked the CSS all pointing towards the font awesome. Any ideas?