NPCs in open world speak but without moving there lips.

[Glanzer]

Forgive me for responding to such an old thread, but this is what came up in my google search so I thought I'd give some more info to people. I just installed all 3 bird mods and started having this same lip movement bug. After some experimentation I found that disabling bird spawns in cities in the MCM menu for Birds of Skyrim, then killing all the spawned birds took care of the problem. So you either have to live with the bug or experiment with the max number of birds and spawn points in areas. And maybe increase the number of max actors in your Wrye Bash script. Changing the max active actors in your bash script tweaks probably won't help because mine is set to 50 and that didn't help me.