I’m having the same problem. But if you look at all the files on your server, you’ll see that script is in many of them 🙁
What plugins do you have installed?
I know this may sound strange…
download a copy of your .htaccess file and open it using notepad/wordpad.
Is there a blank line at the beginning? If so remove it an upload it back to your root.
Did that work? Cause that’s what worked for me… no kidding.