Changing the settings didn't work for me. Besides I need to work in inches because I am making patterns to sew where they will be in inches.
According to one of the other posts you mentioned, this is by design. I don't understand why this is the case when clearly people want objects to actually be next to one another without gaps. This design flaw creates extra work.
Thanks, @ashf for the other posts because a person mentioned export settings, "when I used Bi-linear or Nearest Neighbour algorithm exporting to JPEG - there was no problem with those gaps" and that does work for PNGs as well. So that helps, a lot!
EDIT: the export only works vertically. Horizontal still shows a space.