I've had the same problem and now Maps won't even start !
Well it starts then get killed before doing anything visible and starting navicore from xterm doesn't give me any clue on what's going on ...
May be it has loaded some part of the maps and cannot figure out where it is on the download now ...
I'll try and clean my Memory Cards from the downloads if I can find it and see if it helps ...
Any hint welcome !
Fred