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Beta version are supposed to have bugs as already mentioned, not all problems are due to bugs.
If I were a spammer, I wouldn't wait for the anniversary batch to start spamming. It was exactly the same reason. I upgraded to 2.1b1, saw thebonk type error, changed config.php to see the error on detail, posted here about the problem and kept the site in limbo like that for people over here to see the error. But in response, I get a 'fair warning' that this does not help in bug shoting so will be deleted!