Not exactly sure what you're doing?
I opened a gdb in Mapsource 6.15.6 and selected View > Hide GPS Map Detail, the map disappeared, but some map POI's remained. I then tried to save the track as a gpx, Mapsource crashed.
Please be very specific in the steps you used.
I have Mapsource 6.15.6.
From View I have an option called Switch to Product.
From Switch to Product I have an option called No Map.
With No Map selected I am able to Save As in gpx format without producing a crash.