I hadn't played for a while, and I started again yesterday and wednesday; but I couldn't really play because even when I put the correct responses, I don't get points, almost like I never guessed anything. What could be the problem? (I've tried firefox and IE both, same problem).

Make sure that your keyboard is set to English characters.

I am sure one of the mods can put in alink to another thread that discusses this issue.

This page could help you out:

http://home.comcast.net/~sketchpage/help_squares.html (http://home.comcast.net/%7Esketchpage/help_squares.html)

Thanks, that page helped; apparently my non-unicode language was set to Japanese and not English. It works now.