A tad bit more investigation into it, and I see that the following address
https://blockchain.info/address/1Enjoy1C4bYBr3tN4sMKxvvJDqG8NkdR4Zhas
multiple double spend transactions emanating
today from it, each transaction sending a single Satoshi
to each of a huge number of addresses. One of those addresses is one of mine, and the only place I have ever used that address is an attempted withdrawal from Gox (on around 1/26/14) which failed.
So, apparently the Gox tech team is sending test transactions of 1 Satoshi to each of a zillion customer addresses. I'll interpret this as evidence that they are in fact trying to debug something, as they claim. Just weird.
Anybody out there able to decipher what exactly they are doing?