When I checked which files still contain the old, depreceated URL
api-secure.recaptcha.net
, I have found it in file "components\com_uddeim\recaptchalib.php"
Maybe uddeIM might have a problem? I don't know because I do not require captcha for registered users sending messages with uddeIM on my site.
All I know that Google sais the URL mentioned above has to be replaced by
www.google.com/recaptcha/api
, and with the Joomla 2.5 bultin recaptcha plugin it hepled to make it work.
If you want to find out which other files have to be changed in a Joomla installation, change directory to your Joomla root, and enter following on a Winddows host in a Windows command shell window (so-called "DOS prompt"):