scientic on "[Plugin: Better WP Security] Better WP-Security Crashed My Site"

On some sites this plugin seems to work fine but on others it caused similar misery and I ended up rebuilding sites completly. It took a while to find out it was caused by this plugin. What happens is that somehow it causes scripts to keep firing at the server, running the server down. I got messages like 'Too many redirect' and/or Internal Server Error 500. Even after the server was rebooted this started allover again.
After deleting all BWPS lines from the htaccess and another server reboot things calmed down.
What i wonder is wether this plugin only adds lines in the htaccess or that it also adds changes to the database which are more difficult to revert.