A couple of buglets snuck by in the WordPress 2.0.3 release. There should be a version 2.0.4 release relatively soon. But in the meantime, check out the WordPress 2.0.3 Tuneup Plugin, by Mark Jaquith. It fixes a few of the more obvious/annoying problems (mainly errant “Are You Sure?” dialogs when performing certain admin actions).
More advanced users can also use SVN to track the 2.0 branch like so:
svn co http://svn.automattic.com/wordpress/branches/2.0/