A call to GetSleepState in the AI's Think function reports a sleep state 
of 0 ( AISS_AWAKE ), so it doesn't seem like that's it.

This is the .cpp file.  I suspect I'm missing a flag or just not setting 
some little thing somewhere.
http://pastebin.com/d5194d798

Ryan Sheffer wrote:
> Something that comes to mind is the AI sleep state which will make an NPC
> blink to show that it is sleeping while not in the players PVS. This should
> only happen when an npc is flagged to be checked against the players PVS.
> Its for performance.
>
> Anyway, check NPCThink in CAI_BaseNPC and the function calls:
> CheckPVSCondition();
> UpdateSleepState( bInPVS );
>
> You will need to determine why your NPC is sleeping when it shouldnt be, if
> that is, the npc is actually sleeping.
>
> On Sat, Feb 7, 2009 at 5:47 PM, Walter Gray <[email protected]> wrote:
>
>   
>> I've just created a somewhat skeletal new AI character following the
>> tutorial on the wiki, and assigned it the antlion.mdl model as a
>> placeholder.  I went through, setup hammer and created a map with the
>> npc entity placed in it, and it shows up just fine.  The problem is that
>> the model blinks on and off.  Not some texture flicker, but the entire
>> thing just flashes between being drawn and not at a roughly .5 second
>> interval and I have no idea why.  It seems to do this with other models
>> as well.  Has anyone seen this error before?
>>
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>>     
>
>
>   


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