Yahoo email addresses won't populate

I'm still fairly new to Mac and I found a small issue that is driving me crazy. When composing an email in Yahoo mail, the address box does not auto populate as I type in the names in my contact list. I thought it might just be Safari causing the problem, but I downloaded Firefox and the problem continues.

When I use any other computer, my contacts automatically populate in the To: box. Is there an easy fix for this, or is this something Apple has overlooked?

GGJstudios said:

What do you have checked in Safari > Preferences > AutoFill?

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I have all three options checked. It is supposed to use my contacts list to populate.

ajsnow6234 said:

Just move to Gmail or MobileMe. That'll solve your problem.

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I do have a Gmail account and it works the way it is supposed to. I've had my Yahoo account forever so I still use it as my primary email.