This behavior is typical for the wrong resolution, so the question remains: what resolution?
I suggest you replace your data.zip with this multiresolution one I just uploaded:
[Please Register or Login to download file]
Delete the save file.
Open a txt editor (notepad) and copy/paste the next lines in it. Then save as sys.txt and replace your sys.txt with it.
[debug]
enable_roadshadow=1
show_residentonly=1
enable_roadsign=1
enable_landmark_occlusion=1
show_oneway_3d=1
show_oneway=1
show_gps_pos=1
show_signpost=1
background_navigation=1
screen_calibration=1
skip_eula=1
;max_memory=25000000
[interface]
maxzoom2d=6000000
show_exit=1
shutdown_time=0
defaulttilt3d=7600
[map]
2dheadup=1
3d_max_tiltlevel=10000
3d_max_zoomlevel=3000
3d_min_zoomlevel=40
3d_max_zfar=2000
stop_rotate_on_map_move=1
inertia_on_map_move=1
follow_gps=1
2dheadup=1
3d_scale_carmodel=1
3dcarsizemin=7500
3dcarsizemax=10000
3dcarsizemul=10000
[navigation]
show_current_city=1
show_countrychange=1
autoreplan_action="AUTO"
gps_pos_to_road=1
[poi]
poi_show_all_btn=1
poi_labels=1
show_poi_boundingrects=1
show_poi_areas=1
[roundaboutcam]
enabled=0
centery=50
[smartzoom]
minangle=0
maxangle=80
[sound]
ding=0
queue_length=200
[timezone]
patch_dst=1
[timezones]
use_timezone_setting_fix=1
use_new_timezone_ini=1
timezone_key="Time Zones"
[3d_config]
disable_roadsign_navigation_mode=0
[msnd]
enabled=0
[color=black]
As you see, no resolution lines, no GPS related lines. Let iGO figure out itself.
[/color]