Like many of the similar badges on the site, you can "unlock" the Konami badge multiple times by doing the required steps to unlock it. However, when you key in the code and hit enter, I get no pop up, and my scroll bar disappears. I checked a few of the mystery badges, and clicking them still pops up an "unlocked" message for me.
Not sure if only Konami'd is affected, or if other badges are affected.
Please let old threads die and do not reply to them unless you feel you have something new and valuable to contribute that absolutely must be added to make the discussion complete.
Otherwise, please post a new thread in this forum instead.