After installing, activating and attempting to use Settings, I got a blank screen and that's the last I saw of my WordPress website. Could not login. Received a blank white screen with the word "error" stuck in the top left corner. At the same time, the site appeared to be logged in, but a click of Edit Page quickly produced the blank white error screen again. Needless to say, my site appeared to be in a very vulnerable state.
I requested help to remove (and on the author's website) the plugin but all I received was a link back to the generic info available on the plugin details. Glad I didn't wait to get that. Note: The instructions provided by the plugin author are out of sequence.
Via FTP, I saved a copy of wp-config.php, removed the plugin from the Plugins folder and reloaded files from the latest version of WordPress 3.5.1 from my computer copy to the appropriate online folders. I did NOT copy WP-Content folder files. Also removed BPS folder. (Even tried to restore the backed up htaccess files to avoid other steps as recommended by BPS to no avail; their troubleshooting assumes you can still login.)
Everything works again!