Tonight I tried to log into Spiral Knights as I always do, and instead got this message:

"We couldn't verify the application's digital signature.
Please check that you are launching the application from
the correct website."

I always go dirrectly to http://www.spiralknights.com/play.xhtml

I tried clicking on "If you are having technical difficulties, click here to download the game instead" and was able to play for a few minutes, but suddenly got kicked back to the log in screen.