Seems to be a new problem. Loaded an older file, Civ's were gone. Also been having issues with a blank event log that makes the game unplayable with endless notifications and logs.

Solution that worked for me, rolled installed version to 4.0.13, everything works as intended.

Yeah hoping to have the prompt issue fixed tonight when home. Think it was something added in 4.0.15

I tried 4.0.15 again today, still having the disappearing civ issue

It seems to be on the galaxy map, I had started a game on the alpha quadrant map and they was working okay

Could you maybe share a save game from day 0 before they get deleted?

Sure, I'll try to get one to you soon

https://www.dropbox.com/scl/fi/bw1nu4vzpkh9f7weimwyw/Disappearing-Civs.sav?rlkey=qpkexagamqtjs38f8uix5vvww&st=2wtjwz46&dl=0

If that link doesn't work, I can send the save another way

Thanks! I'm on holiday for a week now, but will prioritise this when I'm home.

I tried reinstalling the game and trying to run previous versions, nothing seems to work. The other civs just disappear. Enjoy your holiday!

So looking at the save file, things seem fine apart from the Voth and Cytherians going on Day 1 (I think I know why).

Looking at your save game, I can see that the base number of empires is correctly set to 110, and that the "marauder" slider that we've repurposed as the actual empire count, is set to 30.

When you start a game, do you see a slider with the empire count set to 30?

Yes I see that slider. When I load that save file, I can see a few civs, Betazeds, Denobulans, Bolians, Anaxar and another. But as I let the game progress, they all disappear and the systems become renamed. If I continue to play, I don't run into any other civs on the map