By default the soldermask Top and Bottom for a troughhole Via in Ultiboard are checked. It would be nice if I could select in the global preferences or PCB proberties of Ultiboard what I want for default for all the via's I place on the design.
Now, when my design is ready I have to think that I should uncheck the soldermask Top and Bottom of all via's on the design and when I did that and place a via the soldermask for this new placed via is checked for Top and Bottom.