I have several smoke domains and sources that each start a fire at a different time (frame).
now it seems that I have an issue with black rectangles that appear, which is my domain.
After reading this question: Is it possible to have more than one smoke simulation in the same scene? I've tried to put my domains and sources on different layers, but it didn't work.
Next I removed all my domains and added one huge domain. This doesn't seem to produce the black rectangles, but now my smoke/fire all starts at the same time and the flames/fire are a bit different now.
Any suggestions on how I can render my multiple smoke/fire domains properly? (in viewport preview everything was fine)