I am a bit out of my depth here, so I hope someone can help me.

The picture I have in production is of someone looking out of a window. I have a backdrop outside and a IDL-Dome. The room is totally closed in. I use one point light outside, and it lights

the scene beautifully.

The lights in the scene (Using IDL) works a treat with amazing depth

I have had two problems, one of which I have solved:

1. almost clowdy, splotchy swhadows on the inside of the window, which is lit only by indirect light, reflecting from the room

2. a series of dark spots on the inside corner where the window and the frame meets. Much like if the frame was moldy

The picture illustrates the problem