A bug I don't understand
Is it the same if you log as admin from the default page or for another page?
I am also wondering in 1.9RC3 full cvs update will give you the last 1.9 update ...
Perhaps you can do an update with the tag BRANCH-1.9. One fix has been done in the part that interest you in august
(check if you have in tiki-login.php
$url = strpos($groupHome,'http://')===0 ? $groupHome : "tiki-index.php?page=".$groupHome;