Lance ... an update where I can now eliminate the WiFi Privacy.
When I posted this, it was choking on my 40-team mixed league. A little while ago, I disabled the Privacy, uploaded that league as well as the two optional singles leagues, then enabled it again.
I was uploading my 14-team scratch league when, near the end, realized I had not disabled the WiFi Privacy and was fully expecting it to fail. To my surprise, it loaded successfully so I can (thankfully !!) say the issue is not there. (Of note: I had turned on NAT traversal prior to attempting the 40-team league; it was originally set to run only if explicitly requested which is what I thought was holding it up.)
I'm guessing that I can probably upload the two singles leagues from my Thursday league; will confirm later.