Correct! Thank you, jazzynico, it was the fill rule. By default, 0.91 uses "evenodd". Before any union operation, I have to switch to "nonzero" on the fill and stroke dialog, top right area.
Correct!
Thank you, jazzynico, it was the fill rule. By default, 0.91 uses "evenodd". Before any union operation, I have to switch to "nonzero" on the fill and stroke dialog, top right area.