We tried using the Windows "Repair" installation option and also had to make sure that the game launches in Administrator mode, but it's working and saving properly.
Update: The in-game feedback system does not work with the dialog open. It may not have been operable at all, but I'm hazy, trying to remember from 5 days ago, and I didn't take notes. That's a whole other bunch of interface features to troubleshoot…
I am playing the game on an iMac thru Steam and am enjoying it tremendously. I feel lucky to have not encountered any significant glitches or bugs yet. [An inane comment, yes, but I couldn't find an existing topic close to the one I need to create. …