There was a paper in a recent issue of Physical Review Letters that went into this topic. I referenced it in this post in a thread dedicated to one of Jerry's interminable tirades on this topic. Basically, the paper concludes that the effect is real, but makes no conclusions as to cause. It does make predictions to what deviation we should have seen in the path of the Rosetta probe in November of 2007. I don't know if anything has been published on this probe's path.

In any case, I'd point out that the size of these anomalies is tiny, on the order of mm/sec for an object moving at several thousand km/sec. It's amazing that we can measure them at all.

PS, I don't even rate Fox as a reliable source for political news, much less scientific. Advice to future posters, use a press release from AIP, APS, NASA, or some other scientific agency rather than one from any news source. I include Scientific American, Science News, and New Scientist in this latter category. They may be better than Fox, but they still have a regrettable taste for expressing tentative results in a dramatic fashion that overstates their significance.

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"I often say that when you can measure what you are speaking about, and express it in numbers, you know something about it; but when you cannot measure it, when you cannot express it in numbers, your knowledge is of a meagre and unsatisfactory kind." - William Thompson, 1st Baron Lord Kelvin

"If it was so, it might be, and if it were so, it would be, but as it isn't, it ain't. That's logic!" - Tweedledee

This isn't right. This isn't even wrong. - Wolfgang Pauli