IE8 refuses to accept Yahoo cookies

I downloaded IE8 a couple weeks ago and every thing has been smooth and fine, untill this morning. I went to to my Yahoo page and recieved a log on screen. It accepted my user name and password, but in little red letters it said "The browser you are using refuses to sign in.(cookies rejected)" I then went to internet options, and allowed all cookies..still same error message..whats up with this? Any solutions? Thanks in advance for any help.

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