I entered the text of my post and clicked Post button without noticing that it requires the Captcha verification. So it complained about the Captcha words not matching. I clicked Back, entered the Captcha, clicked Post again and then it respoded that I had already posted this topic. Which is of course not true. I am stuck.
BTW, why on earth do you require the registered users to verify with Captcha any new post?
Also, your Captchas are extremely hard to read!