Still alive with -40000 hp ;D
I sent an error report 10 minutes before this one happened and it seems to have triggered the infinite invincibility loop. At this point, I could not close all windows as the turns progressed automatically.
How I did it: I was in a battle with creatures doing Damage over time. When I was one turn before dieing, I used my teleport rune and landed somewhere else. But due to the DoT I should also be dead. So then an error report window popped up every turn but I could fight on with negative life (no heroism or anything). So yeah. Then I got into another fight 10 minutes later where I should have died, but the infinite loop happened out of a sudden.
I have no custom addons, classes or whatsoever installed. just ashes of urshok and normal tome.