I've had almost the same problems; the corruption? of save games happen after a number of turns (from 134 to over 230) - while I play everything is ok, but when I reload the game it either crashes or (the last time, yesterday) the cloth map is completely empty of any faction /or at least my faction/.

I have Adventure Content Pack v0.66 and Expanded Factions 5.0, playing as an empire faction with custom sovereign.

Just to add that this last time I reloaded after my sovereign died, so that's the possible reason for empty map. However, the reloaded game shouldn't "remember" my sovereign's death .

Can't remember if the previous corruption happened after Sovereign's death - I think it was sovereign's wife's death.

Well, the only mod out of the three posts in this thread that is common is the Adventure Pack (unless there's more than one issue causing causing the save and load instability).  How will we narrow down the cause?  Could it be to do with mods and using Empire factions?

Best regards,
Steven.

I think I had at least one quest active, yes.

Best regards,
Steven.

This poses an interesting question.

Obviously, crash resports with mods installed are pointless because it may be the mods that crash the game.

But what if there's a problem not with the actual mods but rather some unknown error in how they are processed, or some such? In that scenario,  it is possible that ANY mod could crash the game even if it's "flawless".

So, how do we find a crash that may be caused by using mods in general, but not by a specific mod?