Mapsource can't handle properly new City Navigators, it's a discontinued program since a long time, don't use it to build your .img, use Basecamp (patched) + Mapinstall (patched)
Mobile PC too is old and discontinued, it can have problems too with new maps.
Additionally, be sure to have a basemap in MPC folder, put in BC/MS details at max, be sure your .img is unlocked and it's less than 2 gb.
Use original pc install and unlock by yourself.

sent with my phone