Hello,
What do you mean the plain text is not working anymore, are you getting spam via the module now?
Yes, I am. Quite a bit of it actually. I typically get about 5-6 registrations a day, all very clearly a bot and also very clearly the same general source. After a while of this, I looked into it a bit and noticed the captcha didn't change sometimes when I loaded the page, even across browsers and/or sessions.