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I can't reproduce this either - if you get logged out and log back in, it should let the form POST go through. If the request was just a get, then I suppose the browser could be returning a cached element.

That video might make it clearer, or a set of clear steps (exactly what you're doing/submitting, including what page you were on, etc).

I should also note that if the window is focused, you will stay logged in as long as needed.