Nokia :: N95 8G / Freezes On Navigation After Map Update

I need a little help here. My Nokia N95 8gb was working fine until I decided to do a firmware update. After the firmware update I decided to also update the maps using the map downloader since there are some roads missing in my area.Now the phone itself itself is working fine but I have a problem with the map navigation. I have a 2 year license for navigation for Southern Africa. Since the map update the phone will freeze when trying to calculate a route. You select your destination and when you select "Drive to" it goes back to the map, "Calculating route" appears in the top left corner and the map occasionally spins from North orientation and back again.I tried to restore a backup that I did before I undertook all these changes but it has made no difference to the map. I noticed on the new maps that there are dotted lines in the middle of the roads on the map. These did not appear on the previous map version that I had. The version I updated to is v2.0 wk24 b02.