I've upgraded to 2.0, and everything seems to be working fine except for the part where I log in to the system and my dashboard doesn't really appear. When I log into the admin section, I get the "Welcome [user]" text on the top left of the page and a "Logout ()" right underneath that, but unlike 1.5, there's no horizontal layout bar with links to things like "Link Manager", "Options", "Upload" etc. It's completely blank. There's text right underneath, which reads "Dashboard", and then "Welcome to WordPress...Use these links to get started", but the horizontal links bar is completely gone. I tried to upload my index.php file from the wp-admin folder again, but I can't see any difference. Any advice?