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If you just logged in and are getting this prompt again, you've just hit the "broken cookies" bug that a few people seem to hit but we haven't been able to reproduce and track down. If you're having this problem, please try using the development site.
If you want to do something the development site doesn't do yet, please contact us with what you want and we'll make any edits, etc. by hand.
We appologise for any inconvenience this bug is causing.