When I activate the plugin, it modifies my wp-config.php and .htaccess by adding blank lines to the files.
First of all, no plug-in should modify ANY user files without explicit confirmation from the user.
Second, a blank line at the beginning or end of the wp-config.php file causes a "headers already sent" error. See: http://codex.wordpress.org/FAQ_Troubleshooting#How_do_I_solve_the_Headers_already_sent_warning_problem.3F
Third, adding blank lines to the beginning of the .htaccess file causes problems with other plug-ins (BulletProof Security in my case).
I hate having to clean up my install after a plug-in messes it up.