In my server log I'm seeing hits at /includes/templates/mytemplate/css/none
client denied by server configuration: /home/mysite/public_html/includes/templates/mytemplate/css/none, referer: http://www.my_site.com
Your .css files located in your /includes/templates/mytemplate/css/ folder have references to "none" in them, probably in the form of url(none)
Search your .css files and correct the invalid syntax used in your css statements.
background: url(none) is invalid syntax.