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The OP user block on this recent question is grayed out. I've not seen that before. Does this mean the OP made an account, posted a question, and then deleted the account?
That question was migrated from a site where the OP does have an account. If he or she chooses to register here it'll be un-grayed out.
No registration = nothing to click on.
If the account was deleted it would go back to user4393949.