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I am having the same problem viewing a map on my eTrex 30x.  The map is the Colorado map cogtopo11, which I downloaded from GPSFileDepot.  I installed it on my computer using MapManager, and then installed it from my computer to my Garmin using MapInstall.  No problems so far, the last message being "Installation Complete".  Using my Garmin, I went to Setup > Map > Select Map, which listed my cotopo11 map as disabled.  I enabled it and disabled the only other map listed ("Worldwide DEM Basemap").  Returning to viewing maps, nothing was showing on my device, even when I navigated to the middle of Colorado.  Very frustrating.  Any suggestions?