hi i'm just brand new to video editing, and i'm trying to play with the lighting for a theatre performance and can't figure how to solve this problem i've run into. in the editing window, running through the whole preview i see exactly what i want, but when i close it and run the video in the main window it's largely completely black and the lighting i've edited only shows up here and there. i'm using three light sources.

can anyone help me? thanks very much! (: