The http://www.nissanusa.com" onclick="window.open(this.href);return false; site has a new owners registration and login.
Yes, our older owner login no longer works, and one must register again.
The section that addresses Nav updates lists the 2011 and 2012 LEAF,
but says that the 2011 already has the latest available update.
It says that the updates, CD or HDD, are $149 plus tax and shipping.
I will try another 2011 SD card in my 2011 LEAF as soon as possible.
If that works, we will know that the SD card is not tied to the car,
the VIN, or the particular Nav head unit.
Then, I will try to use the SD card from a 2012 LEAF, when I find one
from a friendly owner.