I wasn't sure what to make of this. I've tried logging into Spiral Knights via my Steam account at different times through the evening. The game loads up fine; but when getting to the log-in screen, there seems to no longer be an option for Steam users to log in on. To be sure, I tried loading the game from the website itself, only to get the same result. Is this some kind of bug, or was there a memo regarding Steam accounts becoming obsolete that I miss, or...?
Not quite sure what happened or how, but the problem was fixed when I logged in today. Nevermind then?