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I am just the opposition.  Ranking very good for Google but hardly not at all on Yahoo and Bing. Boo

I think that's probably fine - we're warning you just to tell you the pages are blocked, but blocking them sounds perfectly sensible. Is Google indexing them at all? I assume that the login page is getting multiple URLs, possibly based on the path people take to it? Ideally, it would help to collapse that to one URL (store the parameters in a form field or visitor session/cookie), but my gut reaction is that that's a nice to have. I suspect you're probably ok.