Perhaps this is a bug report, I have tested this and know 100% Better WP Security
is the problem.
When this plugin is active, all my 301 redirects in my htaccess file stop working.
when testing I discovered that the active plugin is the problem, when I disabled the plugin the 301s work...
An interesting thing I discovered is that the blacklist and admin address re-write code within the htaccess does not cause a conflict (I kept this code with the plugin off). The problem is with the plugin being active.