There seem to be problems with geolookup function, probably because of some memory problems...
If you use the program w/o the receiver- use non-psp290 version - it's somewhat more stable.
You could "unpack" you map with gmdl tool and remove some of the folder inside 1x,2x.. directories...
The cleaner way would be to select the zoom range for you map during map generation (click on "advanced" button)
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