starlightman : Does it occur only during cinematic intro ?

Ingame I don't have this problem but when I'm in some (not all) "cinematic mode" like in the beginning of the third mission (when you have the black bar and walk), it's look like you don't have positioned sound for voice.

But during briefing in the same mission I have positionned sound.

yes, fixed in the dev build for me too.

This problem is very annoying in MP too (with Acre for example) as it use the direct speech channel of the game too.

Same problem on Sound blaster ZxR (win 8.1).
Try without all creative sound option (crystalizer, prostudio etc..) same problem.
Annoying during the campaign :(