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Installed Map Trails, WyTopo, Co Topo, Ok Topo, and Tx Topo all gpsfiledepot maps from Basecamp to new Montana 610. They showed in the device but would not come up in Maps. I then took SD card out of old Oregon 450 and put it in the Montana with the same maps on it. When I went to maps the topo for Wy came up but shortly went away and disappeared. Garmin tech knows there are some problems but no answers or fixes. thank you   

Downloaded Texas, Colorado, and Wyoming 2011 topo maps to basecamp. I formatted a new SDHC 4 gig micro card on a USB card reader/writer and tried to load the maps collectively to the card with mapinstall. At the finish of mapinstall, the message said that the installation was unsuccessful. I then reformatted the card and loaded them one at a time. the only map that would load was the Texas topo. I deleted the Colo and Wy from basecamp and downloaded them again in basecamp. I formatted the card each time prior to trying to load them separately. Neither Colo or Wy would load. What have I done wrong, or is Colo and Wy 2011 topos corrupt or something  wrong with them? I do have Texas 2011 topo currently on the 4 gig card in my Garmin Etrex Vista CX.  Thanks  wl