Another save regarding the unrevealing tile issue. When this turn came up in game it started me with the tracker to the west of my city, which was in its own viewport (the first switch that I noticed in this game). When the viewport switches back to the tracker to the east, on his first movement further east, no tiles are revealed. I'm just including this in case seeing the first example of it in a game gives anyone an idea how to fix it.
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VP 56x35,2
Edit: This is just absolutely maddening. I've given the autosave here because I wanted to show the non-reveal as it happens. I also saved after making the move out of habit. On loading that save, the tiles that should have been revealed by the previous movement remain unrevealed, but in my next movement (north to the desert tile I can see rather than into the unrevealed area, all the tiles that should be uncovered by that move were, including tiles that were left unrevealed prior to the save that should have been revealed. I have no clue what could be going on here.
Edit 2:Reloaded the autosave and the eastern tracker's turn comes up first (not surprising since he's in a viewport centered on my capital), and tiles are revealed normally by moves east. VP switches to western tracker who reveals tiles normally as he moves west. On the next turn the western tracker moves first (makes sense because we don't want more VP switches than necessary) and tiles are revealed normally by further movement west. On eastern tracker's turn, tiles fail to be revealed by further eastern movement. So the only consistency I'm seeing is that the tile revelaing issue pops up for me only east of my starting position (over the last four games), and always immediately after a switch from a viewport that was west of my original viewport. I have no idea if that first viewport shift west matters, it just seems to be the way I explore that it is consistently the first VP shift that occurs. If I have occasion to start over, I'll try to head more east first and see if that makes a differenece.
Edit3 Yeah I'll have to check that if I start another game. Apparently I have a coast to close to me east to force a VP shift that direction first.
Edit 4: Last thing I can think to check from this game, but it seems on any reload when the eastern unit moves first, it can reveal tiles normally, the issue doesn't pop up until the VP switches west and then back again (and every time it switches back again the eastern unit can't reveal tiles regardless of which direction he moves). So koshling, or whoever can check this, you have to play through a couple of turns to see it.