I just came across this problem, and I’m not sure what could be causing it. Has anyone had this same issue before?
http://www.imagerage.com/viewimage.php?file=/picture/jnG61431.jpg
(sorry, can’t get the image to show up, so I just posted the link)
Vray 1.47.03
3dsmax 5
Primary:Irradiance Map
Medium
HSps sub: 20
Interp samples: 20
Secondary: Light Cache
Sub: 500
Sample size: 0.02
Scale: Screen
Do you have any coincident faces?
Can you post the scene ?
wow…i’ve seen many things. Never have I seen this 
it kindof looks like those faces have different material IDs with wireframe material on it.
What kind of lighting are you using? It doesn’t look like a Vray render…
The faces all have the same material ID and the same texture, so I don’t think that’s it, but who knows?
I’m using just a direct light.
I will post the scene as soon as my server is back up. Its been down for a few days.