We have requested our hosts look at this as a matter of urgency. Their response was "Not a problem of ours, basically blaming the scripts." We have yesterday updated our VBulletin scripts, changed the templates etc to no avail and the site is no longer useable. We can keep getting rid by using the tools function in respect of template reloading but the hacker keeps coming back. Please take a look at this and see if you have seen the hack before.