WordPress 3.1.4 is available now and is a maintenance and security update for all previous versions.
This release fixes an issue that could allow a malicious Editor-level user to gain further access to the site.
I have upgraded my WordPress to 3.1.4 everything is working fine. Have you upgraded your WordPress to 3.1.4 ? If not you can update it directly from dashboard or download it from here . For more information of change log you can refer it here.