Multiple Lights Issue

[molok]

Hi all! I need you assistance on this.

 

I'm using V-Ray Adv 3.00.04 and I'm having problems with some instanced lights in a big scene. The thing is that I have a group of lampposts and some of them work, some of them don't and I can't find a reason for that because, every render I made, the on/off pattern changes.

 

I've tried checking "probabilistic lights" on and off and changing the light type but it continues rendering the same way and it's driving me crazy.

 

Hope you can help... Thanks in advance!