It gets more interesting (leading to a crash)
About 2 or 3 turns later, my game had an empty .hst file, so I bumped back a turn. Then, running that turn twice:
I have received the same set of two popups twice before a crash:
1st: TFrontEnd.GetFEEByUID FrontEndElt UID 50014 not found
2nd: TGameSim.ExportMessages Target front end definition not found, seeking front end UID: 50014
Then, I get the (relatively) standard error message that the game crashed, saying to report it here
Also, for information purposes, I have no script report generated on each time I've tried to run the turn. I have not (and will test later) tried going back further to see if I can get through this time, but I wanted to at least post it so it's kept for posterity.
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