1. Check your database.
2. In FTP check to see if any of the core vB files have been compromised. Did you lock any User ID in the /includes/config.php from being modified or deleted? Check to see if of any additional files (that you did not upload).
3. Gather a list of all mods you've installed and any code changes you've made.
4. Did you enable HTML anywhere?
5. How many admins do you have that have access to the Admin CP?
6. Issue a support ticket to vB, give them the information and go from there.
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