Brian
I am not in the office now but we have 2 different types of HP machines and one macbookpro in this particular case. However I think that we have tried to re-render the individual dark frame on a single machine (a mac pro in that case) and it was still dark??
I am not the person who actually works on the models so I am not sure of all the details but when we re-render the single frame (as I said above) does the GI file (that is generated at the beginning of the rendering period) have to be re-generated to eliminate the problem (assuming that it is the variety of machine types that’s causing the problem). just an idea.
The animation of 300 frames has 12 dark frames in seemingly random positions.
Doug