I suppose my tale of confusion is not much different from everyone else's:

-- went to check us in for our return (separate PNRs) from EZE. I was immediately added to the upgrade list and could watch progress on the mobile app. My wife's itinerary, however, was completely missing, despite the fact that she had flown down to EZE on it.

-- called the 1K line. Was on hold for 30 minutes and it took another 10 minutes to resolve the problem. Ultimately her itinerary was restored, though she lost her primo seating assignment.

-- arrived at the EZE gate for word on my upgrade. Was number 3 on the list with 4 seats left when check-in for the flight stopped. The GA upgraded the number one person on the list and then there was an agonizing 20 minute wait. The GA finally called me and the #2 person over and explained that she had seats for us, but could not assign them. It took a total of 3-4 people working for 40 minutes to assign those two seats. I have no idea what the complication was. I was the last one on the plane and sat in my wife's old seating assignment.

On the upside, I am flying domestic legs on Monday. The upgrades for both cleared roughly at the 96 hour mark. This is my first full itinerary purchased and ticketed since the 3/3 cutover. Maybe it's a sign of progress?