Some questions

  1. So, when You are rendering with Brazil, Rhino is blocked and no work can be done?
  2. There is no ‘‘Pause button’’ in the render window?

Yes and yes. So the best way to use Brazil is through Neon, which gives you a raytraced viewport that supports 90% of Brazil’s features(and is based on technology that will underpin the next version of Brazil,) most of the time you don’t have to actually fire up Brazil itself.