Invalid CAPTCHAs - What to Do When CAPTCHAs Won't Work
Aug 24, 2008 · If the CAPTCHA shows both upper and lowercase letters, be sure to enter your characters exactly as displayed. If all the letters have the same case, you might be able to enter it either way, but if you are getting invalid CAPTCHAs, try capitalizing the characters exactly as they're shown. 06. of 08.
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