Good Day,\nLast week I uploaded a GPX file of geocaches from my laptop to the Montana 680. Used the Montana later and found 3 geocaches with it. A couple days later powered it up again for another geocaching trip and when I touched the geocaching icon got the messages that there were no geocaches. Plugged the Montana into the laptop and confirmed the file was in the GPX sub-folder. ???????????????\nIn addition, when I looked at the recent finds, the geocaches we had found were no longer there - just a black space where they would have been.\nI checked to see if there was a Montana software update that might be responsible but there were none - the unit is up to date.\nI am not currently using an additional memory card in the unit and have about a half a gig of available space.\nSign me stumped in Delaware.\nChecked the forum to see if anyone else had this problem but came up empty. The unit is 4 years old.