NFC Card Reader ACR 122 incompatible with Android 4.1 Jelly Beans?

I used the ACR 122 before and it worked flawlessly with an Android < 4.1 phone. I used it to exchange P2P SNEP messsages... But since the phone got 4.1, the reader starts beeping and flashing when you place the phone above it. Does anyone else have found this incompatibility? Any solutions?