We picked up the car on Monday and had the same problem. We thought it may have been that we skipped the set up thing so my wife down loaded the iSmart app and did the registration etc. We loaded up the car today, set the satnav for home and off we went, but the satnav once again did not follow the car, just stayed at the start point. I read through this topic and and tried all the recommended solutions to no avail. I could not find anything to do with the satnav in the online owners manual so phoned the dealer, having explained the problem to the receptionist I was told I would have to take the car in and leave it with them for the day. I decided not to book the car in on the principle that the car delivery dates keep going right and a car on the drive is better than a car at the dealers. We stopped for a coffee and a quick rapid charge and when we got in the car at around 3pm and once again tried the satnav it suddenly had a go button which had not been there previously. Perhaps, as someone stated earlier, there is a software engineer from MG reading these threads and did a software reset on the satnav main server, you never know lol.
Hopefully it will work next trip.