There are a couple of images that i reported to Solve Media that are being problematic. Smoked Salmon might be one. I'll be disabling the level reset tomorrow and base earnings more off of cards played (and claimed or submitted to lotto) rather than successful captcha.
i used to like solvemedia because if you enabled form autofill (using an extension or greasemonkey) the browser can automatically fill in the entire captcha if you guide it with just a few characters, since they use the same set of english phrases. but if you load too many captchas within some period of time they'll serve you unreadable crap for several hours to days: 
They also time out the captcha at a minute or two so if you don't answer before then, it fails. But with the recent change in recaptcha, i get a single readable "word" of five characters every time, and I can come back an hour later to solve the captcha and it hasn't timed out.
Consider allowing the user to switch between the two, like how freebitco.in does it.
Thanks Dalek,
I've reported those images to Solve Media and asked if there is a way to avoid images that aren't human readable being served to my site. The problem with re-captcha, at least in the past when I've used it, is exactly what you've spelled out with the form auto-fill but on a bot/script level. It becomes easier to farm the faucet using automated code and I have to implement other methods of bot detection which is time consuming and re-captcha doesn't offer revenue for the site, so prizes may decrease as a result. In short it's not as simple as offering two CAPTCHA options, but something we're thinking about.