It has to do with CAPTCHA, NOT the fact that you are trying to respond to a TEN-year-old thread, and there are TONS of people having trouble (we have a thread with over 250 posts, about this). Why would you want to post to a thread that old? No.1, it's doubtful the people are still here, hence they won't respond to you; and no.2, there are enough people here that don't like those necro-bumps, and likely won't respond to you. Why not just start a NEW thread, with the same topic / info? The likelihood that people will respond is likely greater, if you do that. People don't like responding to old threads, because they feel duped, for instance.