[_ck_]

That file is not there like you think it is:

http://roadtoanimation.com/forums/my-templates/kakumei/style.css

It’s a 404.

But it might be wordpress interfering with the forums directory since WP is in your webroot.

Strange that it would happen with a static file though.

Triple check that you have

/forums/my-templates/kakumei/style.css

via FTP, make absolutely sure it’s there.

If it is indeed there, download your .htaccess file in your top directory (where WP is) and post it here.