[Plugin: BulletProof Security] Hot link protection

Hello, I added this code to my custom code area and its not working.

RewriteEngine On
RewriteCond %{HTTP_REFERER} !^http://(www\.)?MYSITEADDY\.com(/.*)*$ [NC]
RewriteCond %{HTTP_REFERER} !^$
RewriteRule \.(jpe?g|gif|png)$ – [F]

In the same box right above the above I have this
<Limit GET HEAD POST>
order deny,allow
the addy that I block
</LIMIT>

Am I doing something wrong?

http://ww.wp.xz.cn/extend/plugins/bulletproof-security/