Have a WP blog, glutenfreecanteen.com, recently updated to WP 3.3.1. All worked except the admin toolbar. Was creating a beta site as a subdomain, installed another WP 3.3.1 copy, all was fine. Imported the site information using WP Importer to start debugging the problem and the main site's admin page now only goes to the Welcome page for a new install. Also, the new site on the subdomain fails to come live, it seems the import failed, but there is no log data I can locate to say why.
The wp-config files seem all correct and in their correct locations in the file system.
Any ideas? The main site is frozen until I can regain control of the site.
It seems following the advice to install another WP copy in a subdomain of the site was not the best thing to do.