Just completed writing a post. There's nothing unusual about it - it's plain text, no quotes or BBcodes, non-controversial subject, not-locked thread that I've posted on before, utterly benign content. In 400 posts, I have never had a moderator warning or started a flame war. I just wanted to say "hi" to someone I know from another forum who has joined us.
"Sorry, you have been blocked." (Big red cross) - for security reasons.
[I ran virus and malware scans, just in case - nothing]
I'm happy to edit it if I have accidentally used some US slang that we're not familiar with here in the UK, or whatever. Would just be nice if the error message actually told me what rule I have inadvertently broken, that's all. My psychic powers are in the wash today!
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When you are fighting an invisible monster, first throw a bucket of paint over it.