Had to update my COD4 today to get online with a 1.4 FW update 12mb and now the rapidfire controllers I bought off ebay don't work. "bummer" I didn't really use them much but my boys were disappointed.
when you say that it doesn't work anymore, do you mean that all the buttons don't respond in the XMB menu? If that is the case, you may have a 3rd party controller.
I bought a few white DS3 controllers and found out that they were bootleg. They worked at first but then after the update, they don't work anymore.
As far as rapid fire controllers on official sixaxis and DS3s, mine still works on COD4, COD5, and the CODMW2.