no, it only happens after fighting the butchermen in the butcherman's lair for the Heirloom quest and as long as I am not using auto resolve or auto play. I continued playing in the save after using auto resolve so that the city remains and the bug never occured again.

Could you please tell me where to find the savegames? I had a look in my FE Beta folder but can't seem to find them.

found them, thank you. I will send the email in a couple of minutes.

Is there a city icon in your city list to the left of the screen? There's a bug that's been around since early WoM that causes some or all of the buildings in a city to become invisible randomly, it's usually corrected by building something else in the city which can usually be done by selecting the city from your city list if it's become totally invisible. I've already seen this happen a few times in FE so it hasn't been fixed yet. If it's gone from your list too though than ignore this, that would be one I've not seen yet myself.

ok, it happened again on the same savegame when I was fighting some spiders. It seems that the root of the problem is not the Heirloom quest and the butchermen as Ihfacny rightly stated in reply #5, but it is a general problem with tactical combat.

In my case, the combat was not related to fighting in a quest.

1. Destroyed an enemey outpost near my borders,my city  dissapeared.

2. Reloaded previous save. Instead of destroying outpost, I attacked some trolls, same result, my city dissapeared.

3. Reloaded again, didn't attack anything, and my city remained. Later, I took over an enemy city, nowhere near my dissapearing city. My city dissapeared again anyway.

After the 3rd dissaperance, I also happened to notice that the tile where my city dissapeared from no longer had the food/material resources.

Here is the link to my seperate thread, which has my save game, debug, screen shots, etc. Figured I'd post it here as well, since this is the largest thread with the same issue.

https://forums.elementalgame.com/416860