Yahoo email signature problems


New Email
I followed the instructions exactly (Options>Signature>Color and Graphics>Italic>Type signature>Add to All>Save).
It shows as italic in that box, but when I actually send a message it's plain text, not italic. I have this problem only in Internet Explorer. Mozilla is no problem, but I need to use IE some of the time --- and I need it to be italic!
Thank you. P.S. I ave Win XP SP2