I sent my original question to the TechTeam, not the G2G forum. I had a response suggesting I skip all the known matches. It didn't really address the issue of why I can't see my 16 comparisons, and its not a long-term solution. There was an automatic attachment that suggested the G2G forum as a better place to get attention, so I put my question there, too. My bottom line is "I don't know" if anyone monitors, and I hope someone is paying attention.
I uploaded from MyHeritage a month or so ago with no issue, and I have been uploading from RootsMagic lately. Both worked until yesterday.
I'll probably try the upload again later next week.