getting burnt pathes with bounced light

[rm]

Hi, I'm new to this site and relatively new with vray as well. I got this problem with interior lighting in which i seem to get burnt like patches with gi even though i've turned color mapping to exponential. Initially i have had problems in exterior but when i switched on to exponential it worked fine but not in interior. I'm including a very simple image to show my problem which is around the window frames. Any help will be very appreciated.

Edited July 26, 2010 by rm