I upgraded my remote 1.5 install to 2.0 today, after a local upgrade went smoothly. I'm now locked out of my install - the admin panel is treating me as though I'm a level 0 user, despite me being logged in to the admin account.
The database looks slightly different to my local install, in particular the wp_usermeta table. Rather than having separate rows for information, as my local 2.0 install does, it has some serialized data (but not much - it appears to just be a username and that's it).
Any ideas?