I can't edit in Photoshop on my new computer because the brushes and eraser are inaccurate. The size and edge of the brush are different from the size of the mark that the brush/cursor is producing. I've been using Photoshop for 20 years and never had this problem. Uninstalled and reinstalled, same problem. Turned everything off and then back on. Hardness is set to 100%, Opacity 100%, Flow 100%.
In the attached image, the black circle in the center is the mark left by the brush, the circle around that is the brush. Exact same issue with the eraser.