Oops , Ok this one :
http://www.kramersforum.com/forum/sh...ad.php?t=63671
And in that case you also need to update to the latest stable version of VB, its quiet possible that they got in through VB if you have no kept it all upto date when security patches have been brought out.
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You might also want to login to the admincp and check the forumhome templates etc to make sure it isnt them thats been changed.