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It's crazy. I've tried various changes to try and stop it without much success so far - also the tools in the forum to mass delete stuff isn't working so I have to delete every post by hand 
I'll try turning off registrations for a bit (if I can see how to do that) - see what effect that has.

I'll try turning off registrations for a bit (if I can see how to do that) - see what effect that has.