MAC address help

I am using 2 ethernet shields and they both show up with the same MAC address, I have tried to change one with no luck.

these are the lines I added to the sketch to change the address.

byte mac[] = {0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED};
IPAddress ip(192, 168, 1, 19);

Blynk.begin(auth, mac, ip);

Please consult Arduino_Ethernet_Manual example for all parameters.

@tbarritt. I had the same problem here. I managed to solve only changing the MAC address.
Byte arduino_mac [] = {0xDE, 0xED, 0xFE, 0xBA, 0xAE, 0xEF};

Blynk.begin (auth, " ", 8442, arduino_mac);

I hope I helped you.