Issues with upgrading to 2.1b on localhost

Hello
I'm setting up a new forum on localhost using WAMP server. I've just tried to upgrade to 2.1b, following the instructions here: http://vanillaforums.org/docs/installation-upgrade
When I go to localhost/vanilla the screen is blank but at http://localhost/vanilla/index.php?p=/discussions I can see my forum (minus the CSS changes I made to the old forum). From there I can get to the dashboard, and notice that my category urls have changed to http://localhost:80/vanilla... whereas before the upgrade they were http://localhost/vanilla... Could this be causing an error? Embedding is no longer working (i.e. the page where I have the embed script is blank).
What am I doing wrong?
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Comments
THere was a discussion concerning the post some days ago: http://vanillaforums.org/discussion/comment/202051#Comment_202051