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Not me. Works just fine. Do you have the latest Flash player? Is anything being blocked? What have you recently changed? Are you using Yahoo Clasic email or the New Yahoo mail? When you sign out its plain. I just did that but I am always signed in to my Yahoo homepage.
No problems at all. In fact, way too much clutter for the likes of me. 
yahoo classic. The home page comes up fine. Just when I click to sign into my email. No change in cookie level. No change of programs. Scans come up clean
I did change the program rules in my Norton Firewall for generic host win32 services.
It was set at allow. I changed it to Auto. But that shouldn't have anything to do with it right?
I would think if its a security compromise, it would do more than just mess with my email login. the login page still contains the lock icon and the url starts https
Are you using IE or Firefox?
Does it change when you disable the toolbar for a bit?
Using IE7
What is meant by disabling the toolbar? The toolbar for IE7? I have no added tool bars.
The weird thing is that every other page I go too looks fine. The yahoo email login page even has the correct URL (I checked it against the URL when I logged on to yahoo email from my work computer)
The NIS tool bar.
I don’t have NIS tool bar. I’m running NAV2008