I'm not sure what you heard on the radio, but certainly a press article this week said that it could be the very particle that they are looking for (Higgs boson) that is caused the problem.
In a quantum twist to the tale, experiments from the future created the Higgs boson, which 'time travelled' back to the point at which the machine was started up, collided with other Higgs bosons being created and caused the machine to fail.
I got the impression that the chap who came up with the theory was being a little tongue in cheek.
Comments like this: "At allotted points around the tunnel, the proton beams cross paths, smashing into one another with cataclysmic energy." from the BBC article, are the kind of talk which sends some people into a panic about the experiments.
Far from the impacts being "cataclysmic", the energy released when you hit a panel pin with a small hammer is vast in comparison.
As for the 'cataclysmic energy' statement - read Mr Mistoffelees last post. The Proton beams 'smash' into each other at enormous speed, but that alone isn't a worry.
Neutrinos 'smash' into our bodies at enormous speed, but we don't feel a thing. Each of us has about 50 trillion of them passing straight through us every second, and they don't stop at us - they pass straight through the planet as well. We feel nothing because neutrinos have virtually no mass. A proton has even less - 1,6726 x 10^(-27) kg in fact.