i had this problem when i did a test render , there is no any settings un normal
do u have any std max raytrace reflection in ur scene?
I had some trobles like that change all your materials to vray materials, and check if there is any error in the model.
Another thing this spots only appear after a while i was working if i reset the pc and hit render this spots not appear
Maybe somethig to do with the ram memory i don’t know…
Looks like someone went crazy with a paintball gun.
hey…
in a certain way it’s a nice picture !
Amazing ! This is really impressive !
Sometime it has something to do with “Raytrace Mtl”
It remainds me the pop album from u2 :lol:
nice texturing 
http://www.chaoticdimension.com/forums/phpBB2/viewtopic.php?t=3851&highlight=spots+splotches
check this link it should help you out.
thanx gus for ur comments , the problem disappeared when i remodled the walls , i dont know why ???
there was no raytrace reflections in the scene and no errores in the modeles
thanx ml-a for the link it is so helpful ,
i modeled the walls by spline extrude and convert it to editable poly and made some cuts to assign the difrent mats , is that makes any errors on the modele ???
sorry for my bad english writing
i have the same problem some time ago , and i discovered that the problem was that my walls don´t fix well on the edges , maybe you should try with that…
I also had the same problem with walls modeled with splines and exrude but not so occour as in this case.
i extrude splines for walls all the time. then i usually (dont shoot be because it works well) boolean out the doors and windows.
Man… I have quit the acids 
:lol: it is psychedelic indeed!