I have had a glitch a few times on my 2nd trip to China, going after the missing scientiest signal, where you find wong with the guys arm.
I knock a guy out with darts or the tazer and by the time I get there he's gone. Sometimes if I use see through walls I can see them just under the floor, other times I can't. Regaurdless I can't move them or take the stuff they are carrying. Their weapons are still their and I get points for knocking them out. Any body else had this?