Fixing NPC blinking
In source sdk2013 blinking has been broken for a while. Fixing this is as easy as removing a single line of code.
Go to "c_baseflex.cpp" to the following line
void C_BaseFlex::SetupWeights( const matrix3x4_t *pBoneToWorld, int nFlexWeightCount, float *pFlexWeights, float *pFlexDelayedWeights )
And remove the following line
m_iBlink = AddGlobalFlexController( "UH" );
Congratulations! You have successfully fixed npc blinking it was as easy as that