I upload the day's track to Basecamp. It appears as a magenta line with black dots for the points (via points I would guess?)
Hmmm...all the via points on that new route are orange flags.
In my case ViaSymbol is set to 12,00,00,00 (eWptDot) but I'm not sure if that's the default or something I changed long ago and forgot.
...all the via points are orange flags.
...then upload to my Zumo...the via points are "invisible".