Thanks for your reply, but I am still not at all satisfied.
I uninstalled eCart 6 and replaced it with eCart5. Within 45 minutes I had a fully functioning cart that is also responsive. It takes only some very simple CSS changes to accomplish. Set tables to 100% width, increase font size to medium and narrow up the buttons.
When I pay for an upgrade, I want it to give me everything I had and more - and I want it as easy and intuitive to use as it's predecessor.
eCart 6 fails on both counts. I have paid $100 and gained absolutely nothing.