Unfortunately due to a dramatic sudden rise in failed logins caused by a botnet attempting to brute force logins we've been forced to implement a captcha for the time being. We will remove the captcha when the attack subsides. We've changed the captcha to only appear when certain heuristics are triggered. It may or may not show up to individual users or at certain times. For the majority of users this means that they will not see the captcha the majority of the time.