I seem to have a similar, maybe the same, problem. I started up the Data Logger PC Utility, setup the device, then used TrackRecord: Load Track Points. The lower left panel shows the track as a sort of folder which expands into several dozen track segments, each one with about 50 - 70 points. The entire track should have over 1000 points, but it shows them only in short segments.
When I try File: Export: GPX to export the file, it's disabled unless I open one of those track segments, and then the resulting GPX file has only the 50 - 70 points in that segment. But I need the entire track at once. How do I do this?
I'm happy to send you the log file and/or a screen shot illustrating the problem. I don't see a way to attach these files, so I'll try to send them in a private message.