Ok, this is pretty bad.
Current version of the game, a completely normal game (no mods, no other programs, pure vanilla). Normal difficulty, oddity.
Lvl 8, I walk out of SGS, towards GSM, to clean out some loose ends.
Whenever I kill one of the local rathounds, hourglass appears, and game stops.
I reload several times, try different rathounds, the same thing happens.
If I instead go down to the underpassages and kill a stalker, hourglass appears, game stops.
It seems like I can not kill anything without crashing the game.
What in the world is going on??
(I can access the menu, save/load etc fine, but not take actions in the game)
Edit:
I exit the game and start it up again from desktop, and then it is ok. Phew.
But I wonder what causes this hangup.