WordPress 3.3.1 fixes 15 issues with WordPress 3.3 including XSS. Download 3.3.1 or visit Dashboard --> Updates in your site admin panel.

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It's also breaking hundreds of addons, denying admin access, failing to upgrade and banning owners for no apparent reason.

Just read all the bugs that are cascading from this version, many of which still have not been addressed by any developer.

http://wordpress.org/support/forum/installation
And there has been no official word from the WP people why this is happening.

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