I tried that. It didn't work. So, I uninstalled the app, deleted the whole "mcu_data_v13" folder (kept a copy), and reinstalled. Then I created a new config, and the problem is fixed. I was then able to import all my pin settings. So, I think all is well now. One interesting note: even after a fresh reinstallation, when I create new configs, the DDR tool comes up with my swizzle already in it.
Is there yet another badge for this? (kidding!)