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I am unable to print since changing to yahoo mail plus; they said this was a browser problem

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I have gone to tools and removed the pop up blocker for this web site and still am unable to print an email. the error message is: unknown error has occured while printing

I have gone to tools and removed the pop up blocker for this web site and still am unable to print an email. the error message is: unknown error has occured while printing

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Try the reset described here:
http://kb.mozillazine.org/Problems_printing_web_pages#Reset_printer

Make sure you reset all the preferences for that particular printer, as advised in that article.