v_models disappear after a short time

Hello everyone.
I got a very stupid problem. When i stand still or run for a short while my v_models disappears, or with other words, it isnt drawn. I have to use the primary fire to make the model appear again. And then after a short time it disappears again.

I am using this animation.lua in my Gamemode:
http://www.facepunch.com/threads/936054-NPC-Animations-Version-3?p=21843834#post21843834

The console dont throw any errors. Has somebody an idea where the problem located is?

Greetung Obstsalat

-bumb-
has nobody an idea?