Originally posted by Developer:
You haven't done the latest Security Update on your PowerBook yet.
Oops, my bad.

I thought I was at the latest S/W updates on the Powerbook. Now I am.
Now that both systems are at the same level, the problem still remains in that I can't login to Yahoo Mail without a page redirect error on the DP 450 yet I can login to Yahoo Mail from the Powerbook. I've Emptied the Cache and Reset Safari all to no avail.
The only difference between the two systems is that the DP 450 was set to "Block Pop-Up Windows". I was seeing the "page redirect" msg on the Powerbook as well but Mail loaded fine since it wasn't set to block pop-ups.
Unselecting "Block Pop-Up Windows" worked. I can now login to Yahoo Mail. Why would a page redirect like this be considered a pop-up, though?
To conclude the issue all along was caused by the "Block Pop-Up Windows" being set.
Todd
[Edit] I'm still not pleased. The behavior between the two systems is not the same. Even after unchecking the "Block Pop-Up Windows" I am still not redirected to the mail page. I am thrown back to the login page eventhough I am logged in!! Changing the URL to mail.yahoo.com takes me to my mailbox and presto, I'm logged in. On the Powerbook, though, the login process takes me right to the mail window, not back to the login window. So there still seems to be a redirect issue/bug here.