Entered the address 1055 st gregory st cincinnati, oh in the route option, calculated the route just fine with out rebooting. I am using v4.7 with 2015.20 mapset. I use locked maps and generate the unlock keys then create the maps with Mapsource or Mapinstall. I have also found that map files larger than about 2139 mb may load but will not let you enter and address. Still no POIs. It maybe my imagination but the routes seem to calculate faster with the 4gb memory card but it may be due to the faster read/write speeds of the card.