I have just installed my first phpBB and set it to use reCaptcha to verify new registrations, however noticed that the instruction text (language/en/captcha_recaptcha.php RECAPTCHA_EXPLAIN) is out of date, and not relevant to the images now being served by Google.
Current text states: In an effort to prevent automatic submissions, we require that you enter both of the words displayed into the text field underneath.
however as the images are now taken from Google Streetview, there is usually only a single text string. This is bound to cause some confusion amongst less IT literate users trying to register!