I have the same problem, and do NOT have a mixed DPI setup. I run triple 4k monitors, all at 175%. I am running under Windows 10 x64, build 1803. Paint.net pointers that come from Windows 10 scale correctly. Paint.net pointers that come solely from paint.net do not scale, and are tiny. This is compounded by the grey background -- the pointer is very easily lost in the grey wasteland.
I very much appreciate Paint.net, but suggest two things:
1) A very easy to implement workaround would be a setting to allow the user to change the default background. (I shouldn't have to change the entire OS theme to black just to make the pointers visible in Paint.net !!)
2) The more time-intensive fix is to code support for scaling the pointers up. I feel this should be a priority as more and more of us move to high-DPI monitors, especially folks that do graphics work at this point.
Thanks
