Hello! I am new to Paint.NET, so i am not sure if it is a feature of program I don't understand atm or a bug. When I try to use the brush tool with transparency < 200, I get such strange patterns with distance between circles depending on the mouse moving speed. An when i move the cursor really slow, I just get solid non-transparent color. IMO it makes the transparent brush totally unusable.
And yes, I understand that I can paint with non-transparent color on an empty layer with adjusted transparency. But I do not consider this a solution.