Allright, i think your problem resides on 'color mapping' section. (I thought you were using vray 3 which made color mapping approach 'simpler').
Test these and see if it helps:
1- Change color mapping type to 'linear multiply'
2- Disable 'linear workflow'.
3- Increase 'retrace threshold' (inside light cache) to get rid off problem you see at door. Also change 'number of passes' to 8 (by default i think).
4- Resetting everything to default settings might be another good option and adjust settings one by one and see how they behave.
See this official manual for more information.
Additionally check this tutorial on linear worklflow (general concept).
