Black spots appearing randomly

[dalsayegh]

Hi,

I am renderig an interior scene that contains metals, wood and glass and each time I render a big black spot appears in different locations. What could be causing this? Any help will be appreciated.
Thanks,
Dalia

[vlado]

Do you use any falloff maps? If yes, make sure their "Override material IOR" option is set.

Best regards,
Vlado

[DaForce]

Also make sure you have not architecural maps or raytrace materials. Althought usually the black spot problem is caused by what Vlado said.