Blockland ID "unable to validate"?

[FF]

I started the game and clicked join game before the thing at the bottom said "Welcome, Friendly Fire" and now whichever server I go to says "Could not validate your blockland ID."

Help?

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[FF]

Bump because it's happening again, and this time it's kinda permanent. I've tried restarting, reentering the activation code. Nothing happens.