Another thing to remember if you are using IL is the Render has to calculate the impact of other parts of the scene to render others, so sometimes you will see the display seem to halt, but the Render Bar continues to advance.. depending on what is in the scene, this may happen in spurts, or for me, I have seen the Render Process nearly complete before the Image advances from the point it stopped. (I notice this more using Reflection on Materials in the Material Room than any other time.)

ratscloset
aka John