Jim, it would help the site also to have a no cache meta tag too.
My captcha times out in 3 seconds if I do not submit post after captcha, PIA.
You guys can try this, as it brought me the most success.
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Ctrl-A inside your post, then Ctrl-c to copy what you want to say then close msgbox
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Ctrl-Shift-Delete on Chrome clears the cache
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Click post to open msgbox then Ctrl-a then Ctrl-v to paste what you said before.
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submit right away