BuyManThings on "[Plugin: W3 Total Cache] FTP credentials don't allow to write to file - Continuous notification"

I would definitely say it's your Bulletproof Security settings. This is also applicable to WP Better Security.

There is a setting/tweak related to removing write permissions from .htaccess and wp-config.php, turn that off and you should be good to go.

http://http://buymanthings.com/