I also have problems with the navi system here. The dealership installed an SD card but registers that I'm driving around the US while I'm here in Philippines. They say they will issue me a new sd card. Hope you could get that sorted out, have you been to the dealership and asked about the problem?
Alas the dealer said the Nav is dead and that's why the arrow not going in the right direction to travel.
They said 22,000 Baht (USD 660) to replace the unit and you'll need a new Thailand SD Card at 16,000 Baht (USD 480)
Everything else is working but they also updated the Firmware to 59.502 so now I need to serial hack to install AIO.