Diablo 1 HD Hellfire Mod | Awake

This mod looks beautiful and I'm having no problems EXCEPT when I try to talk to an NPC, clicking gossip or any other option doesn't bring up any text window or anything, simply nothing happens and I can't figure out why.

Hello,
this happened to me when I had no sound device conected (headphones or speakers), but when I conected a sound device it went back to normal.