Okay, on my page controller I set a cookie to pass information. But when someone enters via the homepage no cookie gets set. Not even the SS pastmember cookie. So it's not just my cookie, not cookie gets set on the visitor entering the site on the homepage. Entering on any other page all cookies get set no problem, even the SS pastmember cookie is good.

I've debugged the code an see the set cookie is getting executed but no cookie. Again entering on another page with the indentical cookie code works well.

Okay, figured it out on an Ah Ha moment

At the top of the HomePage.php was a blank line before <?php

You can't do that. There must be NO output before the setcookie and a blank line is output. Normally you'd get a big error, but silverstripe hides the setcookie errors.