As it happens, it fixed itself just now. A combat was not the cause, but rather, the main story advancing. I've just hit the deadline and somewhere after passing out the rollback is working once more.
Good, maybe I'll also add another rollback enable during the main scenes.
Off-topic, but the game keeps switching between sergeant and lieutenant for Koenig. I presume he is meant to be the former.
He should be a simple soldier, since the sergeant have green suit (Rumi now has it).
