I've noticed that I get the house numbers when I leave 3rd party cookies enabled, and a much harder, often impossible captcha when they're disabled. Since leaving them off doesn't break much else, I do, and just fill out the harder captchas when I come across one. By the way, you only have to fill out the "known" word, the one that's all twisted and usually impossible to read until you refresh the image 10 times. Even completely omitting the 2nd word, which is the unknown word that OCR couldn't figure out, it will still validate.