The infection was gone but has returned again. New iphone with no browser history getting popup ads today. And then there's the flood of new members with random-like names. And there's this email from webmaster a week ago:
Recently the Posts on StSC were replaced with a string of code. This problem has been corrected and I hope you will continue...
Seems someone is really trying hard here. I apologize for stating the obvious but doesn't this call into question the competence of your IT folks, or possibly they are complicit in the hack?