There is a security issue with the gotcha in the user registration page, it is blocked by some browsers because the url of the JavaScript gotcha is consider unsercured.
The browser console shows: [blocked] The page at 'https://wiki.openoffice.org/w/index.php?title=Special:UserLogin&returnto=Main+Page&type=signup' was loaded over HTTPS, but ran insecure content from 'http://challenge.asirra.com/js/AsirraClientSide.js': this content should also be loaded over HTTPS. The fix looks simple, just changes to "https:" in the html line: <script src="http://challenge.asirra.com/js/AsirraClientSide.js";></script> My workaround to register was signing in with Internet Explorer. Juande
