Sounds like the problem i have on my one XL when upgrading maps.
Mapsettings.cfg (containing your settings and favourites) copied from previous map folder to new map folder is incompatible with the new map version.
To Fix once new maps have been activated.
1) Backup the mapsettings.cfg file and delete it from the new maps folder.
2) Choose operate my one in tomtom home (assume home is patched)
3) change preferences
4) manage favorites.
5) from there, touch any favorite and you will see option to delete or rename.
6) rename one of the favourites and save the changes.
The Mapsettings.cfg file will now be compatible with the new map version.
7) Reboot tomtom and everything should startup fine.
Alternatively if that method fails to work. Press reset button on base of tomtom with pin for about 10 seconds to reset the tomtom.
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