Forum Moderators: phranque
Completely flush your browser cache (delete it) before testing any new server-side code.
Make sure that this code is located in a .htaccess file in a directory that will be traversed during the directory-walk for the client-requested URL.
If none of this helps, make the changes suggested above and then re-post, showing any rules which precede this new rule, and one or two that follow it (please change all domain name references to "example.com").
Sometimes the problem is rule order, and sometimes the problem is mistaken assumptions because important information has not been posted, and becomes obvious only from looking at the other rules. It may in fact require a complete "code-dump" to find the problem, but that practice is discouraged here unless absolutely necessary.
Jim