(Game Version, 1.3 Legendary Hero)

After a crash to desktop between turns, I restarted the game and loaded the auto-save before the crash. It seems everything else is fine, except all monsters on the map are gone. Since there is no point to continue playing, I decide to file this bug report.

The auto-save before the crush is added below.

https://www.dropbox.com/s/0w470i5mwvcmd1x/PreviousAutoSave.EleSav

Some screen shots:

The lair was guarded by a (strong) stack of Ice Elemental, before the crash.

I explored south-east, so I didn't clear this wolf lair, and it was guarded by Timber wolfs before. I am sure AI didn't clear them too.