Lately you may have encountered the following message when trying to log on:
"You exceeded the maximum allowed number of login attempts. In addition to your username and password you now also have to solve the CAPTCHA below."
Apparently we have been under some sort of bruteforce login attack (yep, I've learned a new word today) earlier this week, causing the board to go into a kind of safe mode to keep out evil.
So if this happened to you: it wasn't anything you did, and hopefully using the captcha you got in okay. And in case you were wondering: yes, the captcha is set to be fairly difficult, to beat the bots...