recaptcha is used at signup only to avoid bots registering. we had that.
One more thing: sign your comments on other user talk pages by typing --~~~~ see wikipedia:de:Hilfe:Signatur for reference. --max 12:27, 13 April 2011 (CEST)
The captcha-System is also activated when posting/editing URLs. And thats the problem.
I see. If you have ideas/feature requests/bugreports please edit the Wiki feature discussion page. But don't forget to sign your edits! --max 18:02, 13 April 2011 (CEST)
On your request captcha on adding links to the wiki has been removed for now. We will see how it goes and evaluate it when we have experience with it. Please read about external links on the Help:Links page. --max 17:19, 20 April 2011 (CEST)