OK first the data:
Old GPs Garmin 64s
New GPs Garmin 64st
Old OS windows 7 Pro
New OS Windows 10
BaseCamp Ver 4.5.2
Ok now the problem.... Under the "OLD" when I finished a hike/Geocache I would receive from my 64s the tracks and Geocaches which I had done. They would show up on the BaseCamp map at the same time. Under the "NEW" both do NOT show up at the same time I have to switch views. It seems the found caches go into a folder "UNLISTED DATA" in BaseCamp.
On one hike/Geocaching outing I did 6 miles 10 Geocaches and only one (the very last one) showed up on the track. When I switched to the "UNLISTED DATA" folder they were NOT there. I can not find them in BaseCamp.
NOTE: all found Caches show up in the found section on my 64s/st
So I am only guessing but for some reason the new is not going into BaseCamp right.