Problems with Vray and Orthographic views

I have a problem with MAX 9-Service pack 1(64-bit) and Vray…I have 6 cameras, 4 of them have orthographic ON and and the other 2 are regular cameras in perspective
Well, the issue is when I render the ortho cameras out at 6000px I got several error messages (overbright materials) but if I reduce the the output at 5500px wide I don’t get those errors…no problem at all with the perspective views at 6000px….I don’t think is memory problem because I have 16GB ram.
Any idea?

No RPC, No architectural materials…only VRaymtl and standard

Thanks,

Fernando