Previously I had Version software 4.3.? and installed an img file at SD card for City Navigator Brazil and it was perfect zooming in and out the streets. After updating software of my Oregon 450t to version 4.50, the streets show on map only under 5m zoom, the maximum zoom. I am able to see 3D buildings, street names, POI and main avenues at medium zoom levels ( 8m.. 15m....500m), but not the streets. I am also able to create and see routes. How can I correct to see the streets at zoom levels 8m...500m? What misconfigured?