livewars - Not modifying (or forgetting to upload) your member.php file is the only thing I can think of that would cause that. If you're sure of that, the only other thing it could be is something with your version of PHP, MySQL, or the way your server is set up.
NeRilkA - As Farranth said, that means you lost connection to your MySQL server... Nothing to do with the hack.
Littlebit - Try downloading the latest version here, and then replace your news query with the one there. If that query is right then there shouldn't be any way it can pull any post but the first in the thread... If that doesn't work though let me know.