I have a completed my first board, a 2 layer board, and it involves a few vias. The lands are all 16 mils. Regardless of how the lands meet - 0 or 90 degrees, I have distance and drill DRC errors on every land joining via. The board has ground polygons on top and bottom and the vias that connect the top and bottom do not report errors.
I've read many things and tried quite a few of the suggestions and I've got to be missing something.