Troubleshooting suggestions:
(i) Look in Garmin folder for GarminDevice.xml file. Open the file in a text reader or browser and look at the paths and file naming for maps. If it doesn't show gmapsupp.img for .System then it will show gmapprom.img and maybe gmapprom1.img also so maybe just try that last naming as a test.
(ii) Perhaps there's a problem with the map itself, open it in GMapTool and check it for correct unlocking and/or errors. Or swap the gmapprom/gmapsupp map naming and see if the one previously appearing now disappears, and vice versa.
(iii) On a media card, x:/Garmin/gmapsupp.img is universal for all devices with a media card slot. So if the map still doesn't work on a card with that path and naming it's definitely faulty or the file size is too big to be seen (must be under 2GiB for FAT16 or under 4GiB for FAT32).
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