I don't know Ozi, but see whether you can determine how many track points it's reading - perhaps it has a limit on the number?
PSS.. Where is everyone Nicko??
I've been doing the same but trying to use my track files in Ozi. For some reason it always on every track I have tried only imports
FYI - on my eXplorist XL, I always transfer the files (e.g. track logs) to the PC using Windows Explorer, and then drag-&-drop